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
protected Label label1, label2;
	protected List<String> valueList = new ArrayList<String>( );
	protected List selValueList = new ArrayList( );
	/**
	 * Usable operators for building map rule conditions.
	 */
	protected static final String[][] OPERATOR;
	private ParamBindingHandle[] bindingParams = null;
	private boolean refreshItems = true;
	protected ReportElementHandle currentItem = null;
	protected static final String[] EMPTY_ARRAY = new String[]{};
	protected List<String> columnList;
	protected int valueVisible;
	protected Table table;
	protected TableViewer tableViewer;
	/**
	 * Constant, represents empty String array.
	 */
	protected static final String[] EMPTY = new String[0];
	private Map<String, String> fExprMap = new LinkedHashMap<String, String>( );
	protected String title, message;
	
	protected IChoiceSet choiceSet;
	protected IExpressionButton expButton;
	protected DataRequestSession session = null;
	protected final ExpressionCodec exprCodec = ChartModelHelper.instance( )
			.createExpressionCodec( );
	/**
	 * @param title
	 */