if (hwndHeader == 0) createParent ();
if (hwndHeader == 0) { if (!show) return; createParent (); }
public void setHeaderVisible (boolean show) {	checkWidget ();	if (hwndHeader == 0) createParent ();	int bits = OS.GetWindowLong (hwndHeader, OS.GWL_STYLE);	if (show) {		if ((bits & OS.HDS_HIDDEN) == 0) return;		bits &= ~OS.HDS_HIDDEN;		OS.SetWindowLong (hwndHeader, OS.GWL_STYLE, bits);		OS.ShowWindow (hwndHeader, OS.SW_SHOW);	} else {		if ((bits & OS.HDS_HIDDEN) != 0) return;		bits |= OS.HDS_HIDDEN;		OS.SetWindowLong (hwndHeader, OS.GWL_STYLE, bits);		OS.ShowWindow (hwndHeader, OS.SW_HIDE);	}	setScrollWidth ();	updateScrollBar ();}