In BUTTON_CB document said: *Between press and release all mouse events are redirected only to this control, even if the cursor moves outside the element. So the BUTTON_CB callback when released and the MOTION_CB callback can be called with coordinates outside the element rectangle.*
But using FLAT_BUTTON_CB callback in IupFlatTabs, if there is only one tab, release the button outside the element will not be called, but if counts of tabs > 1, it is be OK. The issue existed only on Windows7, I test GTK2 and GTK3 on Ubuntu, everythings seem OK. Best Regard
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