Bug 138562 Splite extendsexcpetion to seperate sub class
The suggestion is Parent invalid Cycle extends Different type extends Not top level extends
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ElementFactory.java
TableRow row = (TableRow) newTableRow( columnNum ).getElement( );
			table.getSlot( TableItem.DETAIL_SLOT ).add( row );
			row.setContainer( table, TableItem.DETAIL_SLOT );
		}
		table.refreshRenderModel( module );
		return tableHandle;
	}
	/**
	 * Creates a new table group element. Table groups cannot have a name.
	 * 
	 * @return a handle to the table group
	 */
	public TableGroupHandle newTableGroup( )
	{
		TableGroup element = new TableGroup( );
		module.makeUniqueName( element );
		return element.handle( module );
	}
	/**
	 * Creates a new column element. Columns cannot have a name.
	 * 
	 * @return a handle to the column
	 */
	public ColumnHandle newTableColumn( )
	{
		TableColumn element = new TableColumn( );
		module.makeUniqueName( element );
		return element.handle( module );
	}
	/**