I found a way using the Input only window.
Before creating the dialog window I create an Input window which covers 
entirely the screen and will deactivate the actions on the buttons not covered 
by the dialog window. Then I create the dialog window. 
I don't select any events for the Input window.
and I select the MOUSE events for the dialog window.

My platform is eCos NIOSII Lcd 640*480 Touch panel.

Guy


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