detect when switch tabitem

[myspacee]

Hello,

i've a GUI with some tabitem.

How can detect when user swith to a tab to another ?

Thank you for any info,

m.

[BugFix]

sample:

GuiCreate('test')
$tab = GuiCtrlCreateTab(20,20,200,150)
$item0 = GuiCtrlCreateTabItem('Item 0')
$item1 = GuiCtrlCreateTabItem('Item 1')
GUICtrlCreateTabItem('')

GUISetState()

While True
    $msg = GUIGetMsg()
    Switch $msg
        Case -3
            Exit
        Case $tab
            Switch GUICtrlRead($tab)
                Case 0
                    MsgBox(0, '', 'Item 0')
                Case 1
                    MsgBox(0, '', 'Item 1')
            EndSwitch
    EndSwitch
WEnd