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
{
		if ( expressionValue1 != null && !expressionValue1.isDisposed( ) )
		{
			return 0;
		}
		disposeComposites( );
		
		GridData gd = new GridData( GridData.FILL_HORIZONTAL );
		expressionValue1 = new Combo( condition, SWT.NONE );
		compositeList.add( expressionValue1 );
		expressionValue1.setLayoutData( gd );
		expressionValue1.setItems( popupItems );
		expressionValue1.addListener( SWT.Verify, expValueVerifyListener );
		expressionValue1.addListener( SWT.Modify, textModifyListener );
		expressionValue1.addListener( SWT.Selection, popBtnSelectionListener );
		Composite dummy = createDummy( condition, 3 );
		compositeList.add( dummy );
		
		andLable = new Label( condition, SWT.NONE );
		andLable.setText( Messages.getString( "HighlightRuleBuilderDialog.text.AND" ) ); 
		andLable.setVisible( false );
		compositeList.add( andLable );
		
		dummy = createDummy( condition, 3 );
		compositeList.add( dummy );
		
		expressionValue2 = new Combo( condition, SWT.NONE );
		expressionValue2.setLayoutData( gd );
		compositeList.add( expressionValue2 );