Hi, thans for reply.
Attached example work, but it is not answer to my question?
I have asked for not working binding, for filtering control created as custom control, when binding is applied in control usage.
<controls:SalusGridViewCustomFilteringControl
Items="{Binding AgendaItemTypes}" ItemContainerStyle="{StaticResource AgendaFilteringItemStyle}"/>
</telerik:GridViewDataColumn.FilteringControl>