No colored flat Button possible

[funkey]

Either a flat button or a colored button is possible, not both.

#include <ButtonConstants.au3>

Opt("GUIOnEventMode", 1)

GUICreate("Button-Bug", 200, 110)
GUISetOnEvent(-3, "_Exit")

GUICtrlCreateButton("Flat", 20, 20, 70, 20, $BS_FLAT)
GUICtrlSetBkColor(-1, 0xFF0000)
GUICtrlSetStyle(-1, $BS_FLAT)

GUICtrlSetOnEvent(-1, "_ChangeBkCol")
GUICtrlCreateButton("Standard", 110, 20, 70, 20)
GUICtrlSetOnEvent(-1, "_ChangeBkCol")

GUICtrlCreateButton("Flat", 20, 70, 70, 20, $BS_FLAT)
GUICtrlSetOnEvent(-1, "_MakeDefBkCol")
GUICtrlCreateButton("Standard", 110, 70, 70, 20)
GUICtrlSetOnEvent(-1, "_MakeDefBkCol")

GUISetState()

While 1
	Sleep(100000)
WEnd

Func _ChangeBkCol()
	GUICtrlSetBkColor(@GUI_CtrlId, 0x00FF00)
EndFunc

Func _MakeDefBkCol()
	GUICtrlSetBkColor(@GUI_CtrlId, Default)
EndFunc

Func _Exit()
	Exit
EndFunc

[Valik]

No color means invisible. So with that little obvious nugget of information in mind, think about what you are trying to do and then try thinking about a rather obvious solution.