ac1dm4nner, This is based on some original code by Valik, so most of the credit should go to him: #include <GuiConstantsEx.au3> #include <GuiTab.au3> #include <StaticConstants.au3> ; Tab colours Global $aTabColours[4] = [0xFFC0C0, 0xC0FFC0, 0xC0C0FF, 0xC0C0C0] ; Create GUI Global $hGUI = GUICreate ("Test", 400,300) GUISetBkColor (0xFFFF00) ; Create label to cover Tab "tab" Global $hColourTab = GUICtrlCreateLabel("", 0, 0, 1, 1, BitOR($SS_NOTIFY, $SS_CENTER, $SS_SUNKEN)