Bug 201526 Mutil parameter value will show the mutil value[0705]
Description: Mutil parameter value will show the mutil value[0705] Step: 1. New a list parameter and select allow multiple value 2. Add some value in it. 3. Drop the parameter in layout( param["NewParameter1"] ). 4. Preview and select several value. Actual result: It will preview a object string. Expected result: The value that is selected will be previewed.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/presentation/LocalizedContentVisitor.java
/**
	 * handle an extended item.
	 * 
	 * @param content
	 *            the object.
	 */
	protected IContent processExtendedContent( IForeignContent content )
	{
		assert IForeignContent.EXTERNAL_TYPE.equals( content.getRawType( ) );
		assert content.getGenerateBy( ) instanceof ExtendedItemDesign;
		IContent generatedContent = content;
		
		ExtendedItemDesign design = (ExtendedItemDesign) content
				.getGenerateBy( );
		ExtendedItemHandle handle = (ExtendedItemHandle) design.getHandle( );
		String tagName = handle.getExtensionName( );
		
		if ( "Chart".equals( tagName ) )
		{
			IHTMLImageHandler imageHandler = context.getImageHandler( );
			if ( imageHandler != null )
			{
				String imageId = getImageCacheID( content );
				CachedImage cachedImage = imageHandler.getCachedImage( imageId,
						IImage.CUSTOM_IMAGE, context.getReportContext( ) );
				if ( cachedImage != null )
				{
					return processCachedImage(content, cachedImage);
				}
			}