Bug 189586 [smoke]Fail to preview template item in xls format..[1203]
engine/org.eclipse.birt.report.engine.emitter.prototype.excel/src/org/eclipse/birt/report/engine/emitter/excel/ExcelEmitter.java
.getDesign( ).getReportDesign( ) );
			convert.html2Content( foreign );
			startCase( foreign );			
			ContentEmitterVisitor contentVisitor = new ContentEmitterVisitor(
					this );
			contentVisitor.visitChildren( foreign, null );
			endCase();
		}
	}
	public void startGroup( IGroupContent group )
	{
	}
	/**
	 * If the image is generaged by chart, get the chart data and store them
	 * @param image
	 * 				iamge element
	 */
	public void startImage( IImageContent image )
	{
		if ( image.getGenerateBy( ) instanceof ExtendedItemDesign )
		{
			ExtendedItemDesign eitem = (ExtendedItemDesign) image
					.getGenerateBy( );
			ExtendedItemHandle handle = (ExtendedItemHandle) eitem.getHandle( );
			String tagName = handle.getExtensionName( );
			if ( "chart".equalsIgnoreCase( tagName ) )
			{
				File res = chartConverter.convert( eitem, handle );
				if ( res != null )
				{