Check if there is a new object, could be 'DisconnectedObject'
Make the WPF ListView able to make use of the 'edit' flag for at least the CheckBoxCell and TextCell. In case of TextCell use a TextBlock if it's not editable and a TextBox if it is editable
Changed spaces to tabs
Check if OldValue is of type ValuesContainer
throw the exception if the value is NOT valid

Previously a ArgumentOutOfRangeException has been thrown when a valid value was passed into the State property. Instead the exception should be thrown if the value is *not* valid.
Improved ListView sample
Added a bound CheckBoxColumn
CheckBoxColumn and string based columns in WPF support binding
Replaced spaces with tabs
spaces to tabs
Merge branch 'master' of https://github.com/mono/xwt

Conflicts:
	Samples/Samples/ListView2.cs
	Xwt.WPF/Xwt.WPFBackend.Utilities/CellUtil.cs
Merge pull request #245 from steffenWi/master

WPF Bugfix and enhancements