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 String getExpression( String resultSet )
	{
		if ( provider.getExpressionType( ) == HighlightHandleProvider.EXPRESSION_TYPE_ROW )
		{
			return DEUtil.getColumnExpression( resultSet );
		}
		else if ( provider.getExpressionType( ) == HighlightHandleProvider.EXPRESSION_TYPE_DATA )
		{
			return DEUtil.getDataExpression( resultSet );
		}
		return null;
	}
	private void initializeProviderType( )
	{
		if ( designHandle instanceof DataItemHandle )
		{
			DataItemHandle dataItem = (DataItemHandle) designHandle;
			if ( dataItem.getContainer( ) instanceof ExtendedItemHandle )
			{
				provider.setExpressionType( HighlightHandleProvider.EXPRESSION_TYPE_DATA );
			}
			else
			{
				provider.setExpressionType( HighlightHandleProvider.EXPRESSION_TYPE_ROW );
			}
		}
	}
	
	protected int create2ValueComposite( Composite condition )