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Hello. Drag option works only on parent window but as we can see on the parent gui is showed up child gui (on the right side with the color). Desired action is when we want to drag whole program we can also drag child gui and child gui will drag with parent gui. How to do this? #include <GUIConstantsEx.au3> #include <WindowsConstants.au3> #include <Array.au3> GUIRegisterMsg($WM_NCHITTEST, "_NCHITTEST") $hGUI = GUICreate("Test", 500, 500, -1, -1) $cButton_0 = GUICtrlCreateButton("Child 0", 10, 10, 80, 30) $cButton_1 = GUICtrlCreateButton("Child 1", 10, 50, 80, 30) $cButton_2 = GUICtrlCreateButton("Child 2", 10, 90, 80, 30) GUISetState(@SW_SHOW, $hGUI) ; guis Global $hChild_[3] Global $countGUI = UBound($hChild_) - 1 ;MsgBox("","",$countGUI) ; licznik dla GUI Global $gui = 0 $hChild_[0] = GUICreate("Child 0", 350, 300, 150, 0, $WS_POPUP, $WS_EX_MDICHILD, $hGUI) GUISetBkColor(0xFF0000) GUISetState(@SW_SHOW, $hChild_[0]) $hChild_[1] = GUICreate("Child 1", 350, 300, 150, 0, $WS_POPUP, $WS_EX_MDICHILD, $hGUI) GUISetBkColor(0x00FF00) GUISetState(@SW_HIDE, $hChild_[1]) $hChild_[2] = GUICreate("Child 2", 350, 300, 150, 0, $WS_POPUP, $WS_EX_MDICHILD, $hGUI) GUISetBkColor(0x0000FF) GUISetState(@SW_HIDE, $hChild_[2]) While 1 Switch GUIGetMsg() Case $GUI_EVENT_CLOSE Exit Case $cButton_0 _All_Hide() GUISetState(@SW_SHOW, $hChild_[0]) $gui = 0 Case $cButton_1 _All_Hide() GUISetState(@SW_SHOW, $hChild_[1]) $gui = 1 Case $cButton_2 _All_Hide() GUISetState(@SW_SHOW, $hChild_[2]) $gui = 2 EndSwitch WEnd Func _All_Hide() GUISetState(@SW_HIDE, $hChild_[0]) GUISetState(@SW_HIDE, $hChild_[1]) GUISetState(@SW_HIDE, $hChild_[2]) EndFunc Func _NCHITTEST($hWnd, $uMsg, $wParam, $lParam) If $hWnd = $hGUI Then Local $aPos = WinGetPos($hWnd) If Abs(BitAND(BitShift($lParam, 16),0xFFFF)- $aPos[1]) < 500 Then Return $HTCAPTION EndIf Return $GUI_RUNDEFMSG EndFunc