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
glayout = new GridLayout( 4, false );
		condition.setLayout( glayout );
		expression = new Combo( condition, SWT.NONE );
		gdata = new GridData( );
		gdata.widthHint = 150;
		expression.setLayoutData( gdata );
		expression.setItems( getDataSetColumns( ) );
		fillExpression( expression );
		expression.addSelectionListener( expSelListener );
		expression.addModifyListener( new ModifyListener( ) {
			public void modifyText( ModifyEvent e )
			{
				updateButtons( );
			}
		} );
		Button expBuilder = new Button( condition, SWT.PUSH );
		
		
		
		
		
		expBuilder.setToolTipText( Messages.getString( "HighlightRuleBuilderDialog.tooltip.ExpBuilder" ) ); 
		expBuilder.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				editValue( expression );
			}
		} );
		UIUtil.setExpressionButtonImage( expBuilder );
		operator = new Combo( condition, SWT.READ_ONLY );