Hi,
Thanks for your response. Changing my DataMemberBinding definition
from:
to:
DataMemberBinding=
"{Binding LicType, Converter={StaticResource licTypeConverter}}"
caused the filter symbol to show up. In addition I had to add the CellTemplate definition below to get the values displayed.
Now the controls for filtering are there, but if I open the filter dialog only the value of the first line is displayed as selectable choice of distinct filters. I found the answer to this in the documentation (
http://www.telerik.com/help/silverlight/radtreelistview-features-filtering.html). Which says: Only the values at the highest level of the hierarchy are included in the distinct filter list.
Thanks,
Luzius