call selection screen exit

Hi,all

I've found a problem arising from this sentence "call SELECTION-SCREEN 1001 STARTING AT 10 10",in the main screen. (here the type of screen 1001 is 'Modal Dialog Box')

The 'close' button on the right-top correr of the screen has no effect to close the

screen 1001,so how can I catch the event of click on that button?

Thanks