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
valueListComposite.dispose( );
			valueListComposite = null;
		}
		GridData expgd = new GridData( );
		expgd.widthHint = 100;
		expressionValue1 = new Combo( condition, SWT.NONE );
		expressionValue1.setLayoutData( expgd );
		expressionValue1.addModifyListener( new ModifyListener( ) {
			public void modifyText( ModifyEvent e )
			{
				updateButtons( );
			}
		} );
		expressionValue1.addListener( SWT.Verify, expValueVerifyListener );
		expressionValue1.addListener( SWT.Selection, expValueSelectionListener );
		refreshList( );
		expressionValue1.setItems( popupItems );
		dummy1 = createDummy( condition, 3 );
		andLable = new Label( condition, SWT.NONE );
		andLable.setText( Messages.getString( "FilterConditionBuilder.text.AND" ) ); 
		andLable.setEnabled( false );
		
		dummy2 = createDummy( condition, 3 );
		expressionValue2 = new Combo( condition, SWT.NONE );
		expressionValue2.setLayoutData( expgd );
		expressionValue2.addModifyListener( new ModifyListener( ) {
			public void modifyText( ModifyEvent e )
			{
				updateButtons( );
			}