Blackberry Custom ButtonField - blackberry

Question

This is default look when i launch activity.
After i play around with the wheel track pad then become like this. The button image or whole button lost.
Here is my custom buttonfield which extends ButtonField.
public class Custom_ButtonField extends ButtonField {
Bitmap mNormal;
Bitmap mFocused;
Bitmap mActive;
int mWidth;
int mHeight;
public Custom_ButtonField(Bitmap normal, Bitmap focused,
Bitmap active) {
super(CONSUME_CLICK);
mNormal = normal;
mFocused = focused;
mActive = active;
mWidth = mNormal.getWidth();
mHeight = mNormal.getHeight();
setMargin(0, 0, 0, 0);
setPadding(0, 0, 0, 0);
setBorder(BorderFactory
.createSimpleBorder(new XYEdges(0, 0, 0, 0)));
setBorder(VISUAL_STATE_ACTIVE, BorderFactory
.createSimpleBorder(new XYEdges(0, 0, 0, 0)));
}
protected void paint(Graphics graphics) {
Bitmap bitmap = null;
switch (getVisualState()) {
case VISUAL_STATE_NORMAL:
bitmap = mNormal;
break;
case VISUAL_STATE_FOCUS:
bitmap = mFocused;
break;
case VISUAL_STATE_ACTIVE:
bitmap = mActive;
break;
default:
bitmap = mNormal;
}
graphics.drawBitmap(0, 0, bitmap.getWidth(), bitmap.getHeight(),
bitmap, 0, 0);
}
public int getPreferredWidth() {
return mWidth;
}
public int getPreferredHeight() {
return mHeight;
}
protected void layout(int width, int height) {
setExtent(mWidth, mHeight);
}
}

Answer 1

It looks like you're trying to create a button with an image so you might be better off using the Advanced UI Library published by RIM. Take a look at the BitmapButtonField class.

Answer 2

Set Focusable on constructor.
super(Field.FOCUSABLE);