expose event following button press/release event

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Hi Guys,

Why there is always one expose-event after the button-press-event(and button-release-event)? that means my app redraw itself twice for one button event, which made the app UI flickers, any clues for settling the problem?

My env is as follows:
1, embedded linux system
2, gtk+ running on directfb
3, gtk+-2.16.0 is used

Thanks in Advance,
Tony

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