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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))

; Create tab
Global $hTab = GUICtrlCreateTab(5, 5,390, 290)
Global $hTab_Handle = GUICtrlGetHandle($hTab)

; Create Tab items and colour them
For $i = 0 To 3
    GUICtrlCreateTabItem ("Tab item - " & $i)
    _GUICtrlTab_SetBkColor($hGUI, $hTab, $aTabColours[$i])
    GUICtrlCreateTabItem ("")


GUISetState ()

While 1
    Switch GUIGetMsg ()
        Case $GUI_EVENT_CLOSE
        Case $hTab

Func TabEvent()

    ; Set values
    Local $iTab_X = 5, $iTab_Y = 5, $iTab_Margin = 1
    ; Get index of current tab
    Local $iTab_Index = GUICtrlRead($hTab)
    ; Get coordinates of TabItem
    Local $aTab_Coord = _GUICtrlTab_GetItemRect($hTab_Handle, $iTab_Index)
    ; Get text of TabItem
    Local $sTab_Text = _GUICtrlTab_GetItemText($hTab_Handle, $iTab_Index)
    ; Place label
    GUICtrlSetPos($hColourTab, $iTab_X + $aTab_Coord[0] + $iTab_Margin, $iTab_Y + $aTab_Coord[1] + $iTab_Margin + 1, $aTab_Coord[2] - $aTab_Coord[0] - ($iTab_Margin * 2), $aTab_Coord[3] - $aTab_Coord[1] - ($iTab_Margin * 2) + 5)
    ; Set text
    GUICtrlSetData($hColourTab, $sTab_Text)
    ; Set colour
    GUICtrlsetBkColor ($hColourTab,$aTabColours[$iTab_Index] )
    ; Set focus


Func _GUICtrlTab_SetBkColor($hWnd, $hSysTab32, $sBkColor)

    ; Get Tab position
    Local $aTabPos = ControlGetPos($hWnd, "", $hSysTab32)
    ; Get size of user area
    Local $aTab_Rect = _GUICtrlTab_GetItemRect($hSysTab32, -1)
    ; Create label
    GUICtrlCreateLabel("", $aTabPos[0] + 2, $aTabPos[1] + $aTab_Rect[3] + 4, $aTabPos[2] - 6, $aTabPos[3] - $aTab_Rect[3] - 7)
    ; colour label
    GUICtrlSetBkColor(-1, $sBkColor)
    ; Disable label
    GUICtrlSetState(-1, $GUI_DISABLE)

EndFunc   ;==>_GUICtrlTab_SetBkColor

I am afraid there is no simpler way! :)


Public_Domain.png.2d871819fcb9957cf44f4514551a2935.png Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind

Open spoiler to see my UDFs:


ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area


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