2007-04-19 Chris Toshok <toshok@ximian.com>

2007-04-19  Chris Toshok  <toshok@ximian.com>

	* DataColumnCollection.cs (Add): the Element in our
	CollectionChangedEventArgs should be the column, not the
	collection.  Also, add an event handler for the column's
	PropertyChanged event so we can propagate metadata changes.
	(Remove): Analogous change to the CollectionChangedEventArgs as in
	Add.  Also, unhook the column's PropertyChanged event.
	(OnCollectionmetaDataChanged): emit our new event.
	(ColumnPropertyChanged): called when the column's ColumnName
	property changes.  Emit the proper CollectionChangeEvent.

	* DataView.cs (ColumnCollectionChanged): fix up the comment about
	CollectionChangeAction.Refresh, and make explicit what generates
	it.
	(RegisterEventHandlers): hook up
	DataColumnCollectoin.CollectionMetaDataChanged.
	(RegisterEventHandlers): unhook
	DataColumnCollectoin.CollectionMetaDataChanged.

svn path=/trunk/mcs/; revision=76117