Hello Håkan,
Actually, the mentioned forum post is quite old. Please check the following code snippet which demonstrates how to add ColumnFilterDescriptor:
I strongly recommend you to take a look at
this help article as well.
As a side note I must mention that the support for WPF 3.5 and Silverlight 4 has been discontinued as of Q3 2012. You can check
this blog post for more information.
Regards,
Yoan
Telerik
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