The only way that you could achieve this would be to have a custom filter template (for the whole 3-part thing, i.e. the one with the rounded corners) in addition to a custom filter descriptor, i.e. an IFilterDescriptor implementation. This will allow you to define any
UI and provide any
view model logic behind this UI.
Unfortunately, RadDataFilter is not mature enough and does not provide this right now. However, we have a similar feature request in our PITS system. Please, vote for it
in order to increase its priority.
Let me know what you think after reading the feature description. Will this functionality solve your requirement?
the Telerik team
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Telerik Public Issue Tracking
system and vote to affect the priority of the items