expose event following button press/release event

[Tony Wang <wangtao adi gmail com>]

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