[Creat0R]

Код:

#include <GUIConstantsEx.au3>
#include <GUITab.au3>

$Gui = GUICreate("_GUICtrlTab_SetBkColor() Demo", 320, 280)

$hTab = GUICtrlCreateTab(10, 20, 300, 250)

GUICtrlCreateTabItem("Tab 1")
_GUICtrlTab_SetBkColor($Gui, $hTab, 0xFF0000)

GUICtrlCreateButton("Some Button", 20, 50)

GUICtrlCreateTabItem("Tab 2")
_GUICtrlTab_SetBkColor($Gui, $hTab, 0x00CC00)

GUICtrlCreateCheckbox("Some Checkbox", 20, 50)

GUISetState()

While 1
    $Msg = GUIGetMsg()
    Switch $Msg
        Case $GUI_EVENT_CLOSE
            Exit
    EndSwitch
WEnd

Func _GUICtrlTab_SetBkColor($hWnd, $hSysTab32, $sBkColor)
    Local $aTabPos = ControlGetPos($hWnd, "", $hSysTab32)

    Local $aTab_Rect = _GUICtrlTab_GetItemRect($hSysTab32, -1)

    GUICtrlCreateLabel("", $aTabPos[0]+2, $aTabPos[1]+$aTab_Rect[3]+4, $aTabPos[2]-4, $aTabPos[3]-$aTab_Rect[3]-7)
    GUICtrlSetBkColor(-1, $sBkColor)
    GUICtrlSetState(-1, $GUI_DISABLE)
EndFunc

И ещё по теме: Решение проблемы цвета для элементов на Tab'ах