layout();
layout(false);
public void setBottom(Control control) {	checkWidget();	if (control != null && control.getParent() != this) {		SWT.error(SWT.ERROR_INVALID_ARGUMENT);	}	if (bottom != null && !bottom.isDisposed()) {		Point size = bottom.getSize();		bottom.setLocation(OFFSCREEN - size.x, OFFSCREEN - size.y);	}	bottom = control;	layout();}