Bug 208412 Enhance Chart Engine to process grouped, uni-dimensional Data
chart/org.eclipse.birt.chart.reportitem/src/org/eclipse/birt/chart/reportitem/ChartReportItemPresentationBase.java
}
			else
			{
				String ext = formats.substring( 0, idx );
				if ( isOutputRendererSupported( ext ) )
				{
					return ext;
				}
				else
				{
					return getFirstSupportedFormat( formats.substring( idx + 1 ) );
				}
			}
		}
		
		return "PNG"; 
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.extension.IReportItemPresentation#setModelObject(org.eclipse.birt.report.model.api.ExtendedItemHandle)
	 */
	public void setModelObject( ExtendedItemHandle eih )
	{
		IReportItem item = getReportItem( eih );
		if ( item == null )
		{
			return;
		}
		cm = (Chart) ( (ChartReportItemImpl) item ).getProperty( ChartReportItemUtil.PROPERTY_CHART );