Hi Miłosz Cechnicki,
You can check out the attached project which demonstrates a RadTreeView
with editablle treeviewitem`s Headers. In the editable header template there is a textbox with its text bound to a ViewModel that implements INotifyDataErrorInfo. Hope you may find it useful. You can also check out our new suite of MaskedInput controls here
. They will be officially released with the upcoming telerik Q1 2011 Release.
All the best,
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!