Changes control to given state if hasn't been set yet, preventing a refresh (flickering)
| #include "Window, Screen, Mouse and Control.au3" |
| _GUICtrlChangeState( $hControl, $iState ) |
| $hControl | GUI control handle |
| $iState | GUI control state to change to if not set |
| boolean value | True = Control has been changed, False = Change not needed |