Menutab not shown properly when second menu-item is selected.

Question

When my menutabs are shown everything seems fine, but when you click the 2nd menu-tab the first menu-tab isn't shown properly anymore.
If I have a look at the code-source I can see that the first gif that's needed for the tabbed-view isn't present anymore if the 2nd menu-tab is clicked.
Could somebody explain the different skins that are used by the menuTab component so I know if maybe I've forget to define a specific in my custom skin?
Maybe somebody already used custom skins with your custom images for the tabbed view of menuTabs?
Regards,
Nathalie

Answer 1

>
Yes, you are right. In this sample program,
paintcomponent() is not really necessary, but it is in
the real program I am doing. So I can not get rid of
the paintComponent() method. In this paintComponent()
method I have added (add) and painted (paint) several
JComponent objects and this is the only one which
fails. I can not find the reason why.
Regards.
the reason is that on each call to paint , you add new components to the panel.
the scenario goes like this:
1. frame is made visible -> paintComponent() gets called - > fillPanel() gets called ,
so on the panel are the following 4 components:
one JButton
one JTextField
one JCheckBox
one ComboBox
2. click on the combobox, -> the popup list of the combo is displayed -> paintComponent() is called -> fillPanel() is called
so you have 8 components on the panel;
The popup list remain visible, is not actualy contained in the PanelNullLayout component due to the swing mecanics
3. you select an option in the list, the list becomes invisible, paint() gets called -> fillPanel getsCalled(),
so, again four componets are added. you have 12 components in the panel.
The components are painted in the order they have been added to therir container. The first combo box, that you first clicked, has selected index 1, but the last two have selected index 0. As these two are added after the first one, they are painted "above" first one, so you see the last comboBox added.
Add this code to the paintComponet method if you did not understand
// public void paintComponent(Graphics g) {
// super.paintComponent(g);
// fillPanell();
int count = getComponentCount();
System.out.println("Total components :" +count);
for ( int i = 0; i < count; i++ ) {
Component c = getComponent(i);
if ( c instanceof javax.swing.JComboBox ) {
System.out.println("Selected index in combo " i+" :"+( (JComboBox) c ).getSelectedIndex() );