You can use the ItemPropertyDefinitions property of RadDataFilter to add the ItemPropertyDefinition's. Since this property is a collection property it is read-only, you cannot assign an whole new instance to it. You will have to add individual ItemPropertyDefinitions in code-behind or in XAML.
The FilterDescriptors property of RadDataFilter contains the FilterDescriptors. The same applies for this collection as well. You can iterate over this collection and read what is written in the descriptors. Please note that they can be in a hierarchy, i.e. you may encounter CompositeFilterDescriptors.
I hope this helps.
the Telerik team
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