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
operator.addSelectionListener( operatorSelectionListener );
		create2ValueComposite( condition );
		if ( inputHandle != null )
		{
			syncViewProperties( );
		}
		lb = new Label( innerParent, SWT.SEPARATOR | SWT.HORIZONTAL );
		lb.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
	}
	protected Listener expValueVerifyListener = new Listener( ) {
		public void handleEvent( Event event )
		{
			Combo thisCombo = (Combo) event.widget;
			String text = event.text;
			if ( text != null && thisCombo.indexOf( text ) >= 0 )
			{
				event.doit = false;
			}
			else
			{
				event.doit = true;
			}
		}
	};
	private Listener expValueSelectionListener = new Listener( ) {
		public void handleEvent( Event event )
		{
			Combo thisCombo = (Combo) event.widget;
			int selectionIndex = thisCombo.getSelectionIndex( );
			if ( selectionIndex < 0 )