assert columnNum != 0;
if ( columnNum == 0 ) return null;
	protected Object getPropertyFromColumn( Module module, Cell target,			ElementPropertyDefn prop )	{		assert prop.isStyleProperty( );		ContainerSlot columnSlot = slots[COLUMN_SLOT];		if ( columnSlot.getCount( ) == 0 )			return null;		int columnNum = target.getColumn( module );		if ( columnNum == 0 )			columnNum = getColumnPosition4Cell( module, target );		assert columnNum != 0;		TableColumn column = ColumnHelper.findColumn( module,				slots[COLUMN_SLOT], columnNum );		if ( column != null )			return column.getPropertyFromElement( module, prop );		return null;	}