How to resize a transparent (layered window) when there`s no border or sizing controls to click on? (You can`t use WM_SIZE). I tried to do it with a slider control, but I can`t get it to work. ; ============ React to slider movement ======================== Func WM_H_Slider($hWnd, $iMsg, $wParam, $lParam) #forceref $hWnd, $iMsg, $wParam If $lParam = $Trans_Handle Then $TransValue = GUICtrlRead($Trans) DllStructSetData($tBlend, "Alpha", $TransValue) ; Set Alpha (Transparency) Leve