Bug 135790 ClassCastException in RowData.
ClassCastException is thrown in RowData line 81(IBaseExpression expr = ( IBaseExpression ) valueExpressions.get( index - 1 );).
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/parser/EngineIRVisitor.java
*            The <code>StyleDeclaration</code> object.
	 * @return the name of the style.
	 */
	private String assignStyleName( StyleDeclaration style )
	{
		if ( style == null || style.isEmpty( ) )
		{
			return null;
		}
		
		for ( int i = 0; i < report.getStyleCount( ); i++ )
		{
			
			StyleDeclaration cachedStyle = (StyleDeclaration) report
					.getStyle( i );
			if ( cachedStyle.equals( style ) )
			{
				
				
				style = cachedStyle;
				return Report.PREFIX_STYLE_NAME + i;
			}
		}
		
		
		
		String styleName = Report.PREFIX_STYLE_NAME + report.getStyleCount( );
		report.addStyle( styleName, style );
		return styleName;
	}