I am using "FilterMode="GridFilterMode.FilterRow". For int values there is a "numeric chooser" in the column header and the filter option "contains" is not available.
This is the correct behaviour. But when I bind the column to a ulong, ushort, ... value theses seems to be considered as string. There is no "numeric chooser" and the filter "contains" is available, which resullts in further problems with the OData endpoint.