Bug 312859 The list of operator for Chart filter does not provide 30 visible items
chart/org.eclipse.birt.chart.reportitem.ui/src/org/eclipse/birt/chart/reportitem/ui/dialogs/ChartCubeFilterConditionBuilder.java
expressionValue2.setEnabled( val );
			if ( andLable != null )
			{
				andLable.setEnabled( val );
			}
		}
		else
		{
			setControlEnable( valueListComposite, val );
			if ( val )
			{
				checkAddButtonStatus( );
				checkEditDelButtonStatus( );
			} 
		}
	}
	protected void setControlEnable( Control control, boolean bool )
	{
		if ( control == null || control.isDisposed( ) )
		{
			return;
		}
		control.setEnabled( bool );
		Composite tmp = null;
		if ( control instanceof Composite )
		{
			tmp = (Composite) control;
		}
		if ( tmp != null && tmp.getChildren( ) != null )
		{