Lost of mouse click capability in JDialog

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http://stackoverflow.com – I am developing a simple Swing application using Matisse, NetBeans GUI Builder. I am facing the same problem in all of my windows. When I open a new JDialog over my main JFrame or over other JDialog, when I click somewhere in the background window, I lose the capability to select fields with my mouse in the foreground JDialog. In the image attached, the background window is a JFrame and I build the foreground JDialog with: new JDialog(this, true); Could you give me a hand to solve this problem? As a hint, if after lose mouse capability I use the tab key to advance to 'ComboBox Rol' or cale (HowTos)