FilterCondition filterCond = StructureFactory.createFilterCond( ); filterCond.setExpr( "Expression" ); DesignElementHandle handle = (DesignElementHandle) item; PropertyHandle propertyHandle = handle.getPropertyHandle( ListingHandle.FILTER_PROP ); propertyHandle.addItem( filterCond );
	public boolean doAddItem( Object item, int pos ) throws SemanticException	{		FilterCondition filterCond = StructureFactory.createFilterCond( );		filterCond.setExpr( "Expression" );//$NON-NLS-1$		DesignElementHandle handle = (DesignElementHandle) item;		PropertyHandle propertyHandle = handle.getPropertyHandle( ListingHandle.FILTER_PROP );		propertyHandle.addItem( filterCond );		return true;	}