Bug 119216 Regression: Group can't be added in layout editor.
Description: Group can't be added in layout editor. Steps to reproduce: 1. Add a table. 2. Right click on the table and find that "insert group" is grayed out.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/actions/InsertGroupActionFactory.java
TableHandle table = (TableHandle) group.getContainer( );
				return DEUtil.findInsertPosition( table.getGroups( )
						.getElementHandle( ), group, table.getGroups( )
						.getSlotID( ) );
			}
			else if ( getListBandProxy( ) != null )
			{
				DesignElementHandle group = getListBandProxy( )
						.getElemtHandle( );
				ListHandle list = (ListHandle) group.getContainer( );
				return DEUtil.findInsertPosition( list.getGroups( )
						.getElementHandle( ), group, list.getGroups( )
						.getSlotID( ) );
			}
		}
		return POSITION_INNERMOST;
	}
	/**
	 * Returns the insert position
	 * 
	 * @return the insert position
	 */
	abstract protected int getPosition( );
}
class InsertAboveGroupAction extends InsertPositionGroupAction
{
	/**
	 * @param editParts
	 */
	public InsertAboveGroupAction( List editParts, String text )