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
} );
		underline.setToolTipText( Messages.getString( "HighlightRuleBuilderDialog.tooltip.Underline" ) ); 
		linethrough = createToggleButton( fstyle );
		linethrough.setImage( ReportPlatformUIImages.getImage( AttributeConstant.TEXT_LINE_THROUGH ) );
		linethrough.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				isLinethroughChanged = true;
				previewLabel.setLinethrough( linethrough.getSelection( ) );
				previewLabel.redraw( );
			}
		} );
		linethrough.setToolTipText( Messages.getString( "HighlightRuleBuilderDialog.tooltip.Text_Line_Through" ) ); 
		Composite back = new Composite( innerParent, SWT.NONE );
		back.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
		glayout = new GridLayout( 1, false );
		back.setLayout( glayout );
		lb = new Label( back, 0 );
		lb.setText( Messages.getString( "HighlightRuleBuilderDialog.text.BackgroundColor" ) ); 
		backColor = new ColorBuilder( back, 0 );
		gdata = new GridData( );
		gdata.widthHint = 50;
		backColor.setLayoutData( gdata );
		backColor.setChoiceSet( ChoiceSetFactory.getElementChoiceSet( ReportDesignConstants.STYLE_ELEMENT,
				StyleHandle.BACKGROUND_COLOR_PROP ) );
		backColor.setRGB( null );
		backColor.addListener( SWT.Modify, new Listener( ) {
			public void handleEvent( Event event )
			{
				previewLabel.setBackground( ColorManager.getColor( backColor.getRGB( ) ) );