Hello again my friends… 
When I click in the screen of my monitor model, I would like to make show a Simple JOptionPane.showInputDialog, but I noticed that this is not possible to use directly on JME…
what I have to do???
I just want to show a JOptionPane with Input, that, if the user answer correctly, my screen monitor will change its texture to a certain image, and if its wrong, its change to another texture…
here's what I've done. I know that it is completely wrong, i'm just posting it here to you guys know where I want to make a JOptionPane shows up and verify if the String was correct…
//se o bot
something like JOptionPane.showInternalFrame???
after a lot of tries, I got the conclusion that you have to clear the panel first before you can dispose a frame… after doing this I can dispose my JMEDesktop without "bug" my game…
But like darkfrog said, it's not a good ideia to always dispose and create a new JMEDesktop, the I just set my jmeDesktop to be "CULL_ALWAYS" and when I need it again, I get the JPanel, clean it, and then reconstruct the Frame…
I think its the better solution… ;) 
If someone has some trouble using JMEDesktop, the solution is already solved in the latest versions of it::
the method showDialog has inside the JOptionPane call: the only thing to do is to change it for the way we want it:
[move]For Example:[/move]
private void showInputDialog() {
final JDesktopPane desktopPane = jmeDesktop.getJDesktop();
final JInternalFrame modalDialog = new JInternalFrame( "Input Dialog Message" );
[b]JOptionPane optionPane = new JOptionPane(
"The only way to close this dialog is byn"
+ "pressing one of the following buttons:n",
JOptionPane.QUESTION_MESSAGE,
JOptionPane.YES_NO_OPTION);[/b]
modalDialog.getContentPane().add( optionPane );
jmeDesktop.setModalComponent( modalDialog );
desktopPane.add( modalDialog, 0 );
modalDialog.setVisible( true );
modalDialog.setSize( modalDialog.getPreferredSize() );
modalDialog.setLocation( ( desktopPane.getWidth() - modalDialog.getWidth() ) / 2,
( desktopPane.getHeight() - modalDialog.getHeight() ) / 2 );
jmeDesktop.setFocusOwner( optionPane );
optionPane.addPropertyChangeListener( JOptionPane.VALUE_PROPERTY, new PropertyChangeListener() {
public void propertyChange( PropertyChangeEvent evt ) {
modalDialog.setVisible( false );
jmeDesktop.setModalComponent( null );
desktopPane.remove( modalDialog );
}
} );
desktopPane.repaint();
desktopPane.revalidate();
}
8)