HELP PLEASE!- Paint Program Not "Drawing"

Hello, Please help. I have a paint program for school due tommorow, but it doesn't seem to be working. The code attached is a a smaller version of my program. Only the "Brush:Stroke" tool under "Brush" works in that program provided.

I have a menubar on the top of the screen, which I made into a tools bar. There is also two panels attached in a borderlayout. One is the title, with a label "untitled", at the top, under the menubar, and the other is the panel that sets the colours and thickness etc at the bottom (set to "South"). When i select my brush:Stroke button, I'm supposed to be able to draw in the middle, since its a brush tool. The problem is that it doesn't show up, and the only way for it to show up is if I click and hold on a panel (using the tool), then dragging it into the centre draw area. For example, I select the brush:stroke tool under "brush" then inorder for me to draw, I have to click and hold onto a panel (lets say the bottom one) and drag it to the middle for it to show up.

Can someone please help me? I really don't know what is wrong. This is due tommorow and I need urgent assistance, Thank You.

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class SketchPadHelp extends java.awt.Frame implements ActionListener
{
    // Place instance variables here
    Menu objMenuFile;
    Menu objSeperator;
    Menu objMenuBrush;

Color col = Color.black;  //stores the color of the paint brush
    Color col2 = Color.red;  //stores the color of the paint brush
    String brushStroke = "circleBrush";
    String shapeSelect = "none";
    Label sizeLabel = new Label ("Stroke Size:");
    TextField size = new TextField ("10");
    int radius = Integer.parseInt (size.getText ()); //Turns a string into an integer.

Button blankButton = new Button (" ");
    Button blankButton2 = new Button (" ");
    // blankButton.setVisible (false);
    // blankButton2.setVisible (false);

//ToolButtons
    Button boxButton = new Button ("Box");
    Button lineButton = new Button ("Line");
    Button brushButton = new Button ("Brush");
    Button ovalButton = new Button ("Oval");
    Button eraserButton = new Button ("Eraser");
    Button spraycanButton = new Button ("Spray");
    //ColourButtons
    Button fillButton = new Button ("  ");
    Button strokeButton = new Button ("  ");

Button darkBlueButton = new Button ("  ");
    Button blueButton = new Button ("  ");
    Button lightBlueButton = new Button ("  ");

Button darkRedButton = new Button ("  ");
    Button redButton = new Button ("  ");
    Button pinkButton = new Button ("  ");

Button darkGreenButton = new Button ("  ");
    Button greenButton = new Button ("  ");
    Button lightGreenButton = new Button ("  ");

Button darkYellowButton = new Button ("  ");
    Button yellowButton = new Button ("  ");
    Button lightYellowButton = new Button ("  ");

Button darkBrownButton = new Button ("  ");
    Button brownButton = new Button ("  ");
    Button orangeButton = new Button ("  ");

Button darkPurpleButton = new Button ("  ");
    Button purpleButton = new Button ("  ");
    Button lightPurpleButton = new Button ("  ");

Button blackButton = new Button ("  ");
    Button greyButton = new Button ("  ");
    Button whiteButton = new Button ("  ");

//LayoutSettings
    Label titleLabel = new Label ("Untitled");
    Panel colourPanel = new Panel ();
    Panel optionsPanel = new Panel ();
    Panel settingsPanel = new Panel ();
    Panel sizePanel = new Panel ();
    Panel fillTypePanel = new Panel ();
    Panel titlePanel = new Panel ();

boolean drawBallOn = false;

int x1, y1, x2, y2, oldx, oldy;        //These are the coordinates of the mouse when it is pressed
    //and x2,y2 are the coordinates where the mouse is released.
    
    protected void drawBall (Graphics g, int x, int y)  //this draws a ball on the screen
    {
        radius = Integer.parseInt (size.getText ()); //Turns a string into an integer.
        g.setColor (col);
        g.fillOval (x - radius, y - radius, 2 * radius, 2 * radius);
    }

public boolean mouseDown (Event e, int x, int y)  //this method is called when the mouseis first pressed
    {

x1 = x; //Save the coordinates incase you are drawing a box.
        y1 = y;

Graphics g = getGraphics ();
        if (drawBallOn)     //If your drawing a ball do it here
        {
            drawBall (g, x, y);
        }

return (true);
    }

public boolean mouseDrag (Event e, int x, int y)  //this method is called every time the mouse is draged
    {
        x2 = x;     //save the position of the mouse
        y2 = y;
        Graphics g = getGraphics ();
        if (drawBallOn) //If we're drawing a ball do it here
        {
            drawBall (g, x, y);
        }

return (true);
    }

public void init ()
    {
        setBackground (Color.white);

buildMenuFile ();
        buildMenuSeperator ();
    
        buildMenuBrush ();

MenuBar objMenuBar = new MenuBar ();

setMenuBar (objMenuBar);
        objMenuBar.add (objMenuFile);
        objMenuBar.add (objSeperator);
        objMenuBar.add (objMenuBrush);

//TitlePanel
        titlePanel.add (titleLabel);

//SettingsPanel
        optionsPanel.add (settingsPanel);
        optionsPanel.add (colourPanel);
        optionsPanel.setBackground (new Color (240, 240, 240));

settingsPanel.setLayout (new GridLayout (1, 2));
        settingsPanel.add (sizePanel);
        settingsPanel.add (fillTypePanel);

sizePanel.add (size);

fillTypePanel.setLayout (new GridLayout (2, 1));
        fillTypePanel.add (strokeButton);
        fillTypePanel.add (fillButton);

//ColourPanel
        colourPanel.setLayout (new GridLayout (3, 8));

// blankButton.setBackground (Color.white); //set the blue buttons color to blue
        // colourPanel.add (blankButton);

fillButton.setBackground (col2); //set the blue buttons color to blue
        strokeButton.setBackground (col); //set the blue buttons color to blue

whiteButton.setBackground (Color.white); //set the blue buttons color to blue
        colourPanel.add (whiteButton);

pinkButton.setBackground (new Color (225, 128, 128)); //set the blue buttons color to blue
        colourPanel.add (pinkButton);

orangeButton.setBackground (new Color (255, 130, 4)); //set the blue buttons color to blue
        colourPanel.add (orangeButton);

lightYellowButton.setBackground (new Color (225, 225, 128)); //set the blue buttons color to blue
        colourPanel.add (lightYellowButton);

lightGreenButton.setBackground (new Color (128, 225, 128)); //set the blue buttons color to blue
        colourPanel.add (lightGreenButton);

lightBlueButton.setBackground (new Color (121, 188, 255)); //set the blue buttons color to blue
        colourPanel.add (lightBlueButton);

lightPurpleButton.setBackground (new Color (255, 196, 255)); //set the blue buttons color to blue
        colourPanel.add (lightPurpleButton);

greyButton.setBackground (new Color (128, 128, 128)); //set the blue buttons color to blue
        colourPanel.add (greyButton);

redButton.setBackground (Color.red); //set the blue buttons color to blue
        colourPanel.add (redButton);

brownButton.setBackground (new Color (128, 64, 0)); //set the blue buttons color to blue
        colourPanel.add (brownButton);

yellowButton.setBackground (Color.yellow); //set the blue buttons color to blue
        colourPanel.add (yellowButton);

greenButton.setBackground (Color.green); //set the blue buttons color to blue
        colourPanel.add (greenButton);

blueButton.setBackground (Color.blue); //set the blue buttons color to blue
        colourPanel.add (blueButton);

purpleButton.setBackground (new Color (128, 0, 255)); //set the blue buttons color to blue
        colourPanel.add (purpleButton);

blackButton.setBackground (Color.black); //set the blue buttons color to blue
        colourPanel.add (blackButton);

darkRedButton.setBackground (new Color (128, 0, 0)); //set the blue buttons color to blue
        colourPanel.add (darkRedButton);

darkBrownButton.setBackground (new Color (89, 45, 0)); //set the blue buttons color to blue
        colourPanel.add (darkBrownButton);

darkYellowButton.setBackground (new Color (191, 191, 0)); //set the blue buttons color to blue
        colourPanel.add (darkYellowButton);

darkGreenButton.setBackground (new Color (0, 128, 0)); //set the blue buttons color to blue
        colourPanel.add (darkGreenButton);

darkBlueButton.setBackground (new Color (0, 0, 128)); //set the blue buttons color to blue
        colourPanel.add (darkBlueButton);

darkPurpleButton.setBackground (new Color (64, 0, 128)); //set the blue buttons color to blue
        colourPanel.add (darkPurpleButton);

//Layout
        setLayout (new BorderLayout ());
        add (optionsPanel, "South");
        add (titlePanel, "North");

}

public boolean action (Event e, Object o)  //Detemine what happens when a button is pressed
    {

if (e.target == darkBlueButton) //if the blue button is pressed
        {
            col = (new Color (0, 0, 128)); //set the color to blue
        }
        if (e.target == blueButton) //if the blue button is pressed
        {
            col = Color.blue; //set the color to blue
        }
        if (e.target == lightBlueButton) //if the blue button is pressed
        {
            col = (new Color (121, 188, 255)); //set the color to blue
        }
        if (e.target == darkRedButton) //if the blue button is pressed
        {
            col = (new Color (128, 0, 0)); //set the color to blue
        }
        if (e.target == redButton) //if the blue button is pressed
        {
            col = Color.red; //set the color to blue
        }
        if (e.target == pinkButton) //if the blue button is pressed
        {
            col = (new Color (225, 128, 128)); //set the color to blue
        }
        if (e.target == darkGreenButton) //if the blue button is pressed
        {
            col = (new Color (0, 128, 0)); //set the color to blue
        }
        if (e.target == greenButton) //if the blue button is pressed
        {
            col = Color.green; //set the color to blue
        }
        if (e.target == lightGreenButton) //if the blue button is pressed
        {
            col = (new Color (128, 225, 128)); //set the color to blue
        }
        if (e.target == darkYellowButton) //if the blue button is pressed
        {
            col = (new Color (191, 191, 0)); //set the color to blue
        }
        if (e.target == yellowButton) //if the blue button is pressed
        {
            col = Color.yellow; //set the color to blue
        }
        if (e.target == lightYellowButton) //if the blue button is pressed
        {
            col = (new Color (225, 225, 128)); //set the color to blue
        }
        if (e.target == darkBrownButton) //if the blue button is pressed
        {
            col = (new Color (89, 45, 0)); //set the color to blue
        }
        if (e.target == brownButton) //if the blue button is pressed
        {
            col = (new Color (128, 64, 0)); //set the color to blue
        }
        if (e.target == orangeButton) //if the blue button is pressed
        {
            col = (new Color (255, 130, 4)); //set the color to blue
        }
        if (e.target == darkPurpleButton) //if the blue button is pressed
        {
            col = (new Color (64, 0, 128));  //set the color to blue
        }
        if (e.target == purpleButton) //if the blue button is pressed
        {
            col = (new Color (128, 0, 255));  //set the color to blue
        }
        if (e.target == lightPurpleButton) //if the blue button is pressed
        {
            col = (new Color (255, 196, 255));  //set the color to blue
        }
        if (e.target == blackButton) //if the blue button is pressed
        {
            col = Color.black;  //set the color to blue
        }
        if (e.target == whiteButton) //if the blue button is pressed
        {
            col = Color.white;  //set the color to blue
        }
        if (e.target == greyButton) //if the blue button is pressed
        {
            col = (new Color (128, 128, 128));  //set the color to blue
        }
        fillButton.setBackground (col2); //set the blue buttons color to blue
        strokeButton.setBackground (col); //set the blue buttons color to blue
        return (true);
    }

public void paint (Graphics g)
    {

} // paint method

private void buildMenuFile ()
    {
        MenuItem objMenuItem;

objMenuFile = new Menu ("File");

objMenuItem = new MenuItem ("New");       //New
        objMenuItem.addActionListener (this);
        objMenuFile.add (objMenuItem);

objMenuItem = new MenuItem ("Open");   //Open...
        objMenuItem.addActionListener (this);
        objMenuFile.add (objMenuItem);

objMenuItem = new MenuItem ("Save");      //Save
        objMenuItem.addActionListener (this);
        objMenuFile.add (objMenuItem);

objMenuItem = new MenuItem ("Save As"); //Save As...
        objMenuItem.addActionListener (this);
        objMenuFile.add (objMenuItem);

objMenuFile.addSeparator ();          //add a horizontal separator line

objMenuItem = new MenuItem ("Quit");      //Quit
        objMenuItem.addActionListener (this);
        objMenuFile.add (objMenuItem);
    }

private void buildMenuSeperator ()
    {
        MenuItem objMenuItem;
        objSeperator = new Menu ("ll     ");
    }

private void buildMenuBrush ()
    {
        MenuItem objMenuItem;

objMenuBrush = new Menu ("Brush");

objMenuItem = new MenuItem ("Brush:Round");
        objMenuItem.addActionListener (this);
        objMenuBrush.add (objMenuItem);

objMenuItem = new MenuItem ("Brush:Square");
        objMenuItem.addActionListener (this);
        objMenuBrush.add (objMenuItem);

objMenuItem = new MenuItem ("Brush:Caligraphy");
        objMenuItem.addActionListener (this);
        objMenuBrush.add (objMenuItem);
    }

public void actionPerformed (ActionEvent event)
    {
        String strMenuName;

strMenuName = event.getActionCommand ();

if (strMenuName.equals ("Quit"))
        {
            System.exit (0);
        }

if (strMenuName.equals ("Brush:Round"))
        {
           
            drawBallOn = true;
   
        }

}

public static void main (String args[])
    {
        SketchPadHelp objAppFrame = new SketchPadHelp ();

objAppFrame.addWindowListener (     //Register an anonymous class as a listener.
                new WindowAdapter ()
        {
            public void windowClosing (WindowEvent e)
            {
                System.exit (0);
            }
        }
        );
        objAppFrame.setTitle ("SketchPad");
        objAppFrame.setSize (600, 600);                    //set Frame: width, height
        objAppFrame.init ();
        objAppFrame.setVisible (true);                     //Make frame visible. (replaces JDK 1.1's .show())

} // main()
} // Draw class