Bug 209126 DataException throws out when set highlight condition in sub-report[0302]
Description: Set highlight condition in sub-report, when "select value..." in the highlight dialog, DataException throws out. Build version:2.3.0.v20071108-0800 Steps to reproduce: 1.Get the attached report design file, which contains a sub-report. 2.Select the inner table, and then go to "highlight" tab in the property editor view to set a highlight rule. When click "select value...", DataException throws out. Error: The expression's value can not be retrieved. An error happened in data type conversion. Can not convert the value of org.eclipse.birt.data.engine.script.DataExceptionMocker@79c17b to Integer type.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/HighlightRuleBuilder.java
{
	protected IExpressionProvider expressionProvider;
	protected transient String bindingName = null;
	protected ReportElementHandle currentItem = null;
	protected String[] popupItems = null;
	protected static String[] EMPTY_ARRAY = new String[]{};
	private static final String NONE_DISPLAY_TEXT = Messages.getString( "HighlightRuleBuilderDialog.displayText.None" ); 
	protected static String[] actions = new String[]{
			Messages.getString( "ExpressionValueCellEditor.selectValueAction" ), 
			Messages.getString( "ExpressionValueCellEditor.buildExpressionAction" ), 
	};
	protected ParamBindingHandle[] bindingParams = null;
	/**
	 * Usable operators for building highlight rule conditions.
	 */
	public static final String[][] OPERATOR;
	protected List columnList;
	/**
	 * Constant, represents empty String array.
	 */
	private static final String[] EMPTY = new String[0];