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