static HWND GetTopLevelHWND(HWND aWnd)
static HWND GetTopLevelHWND(HWND aWnd, PRBool aStopOnFirstTopLevel = PR_FALSE)
static HWND GetTopLevelHWND(HWND aWnd){  HWND curWnd = aWnd;  HWND topWnd = NULL;  while (curWnd)  {    topWnd = curWnd;    curWnd = ::GetParent(curWnd);  }  return topWnd;}