if (Event.current.type == EventType.mouseDown && currentTool == CurrentTool.NONE &&  Tools.current != Tool.View && Event.current.button == 0)
{
 if (GUIUtility.hotControl == 0 && !currentEvent.isKey && !currentEvent.alt && !currentEvent.control && !currentEvent.shift)
        {
            startSelectedRect = Event.current.mousePosition;
            currentTool = CurrentTool.SELECT_RECT;
    }
}