We haven't tested this approach with our controls, however, in order to access the used ScrollViewers inside them, you will need to extract their Control Templates as explained in the following topic:
Editing Control Templates
For RadComboBox, for example, you will have to extract the EditableComboBox
( used according to the IsEditable value), find in them the ScrollViewer with Key set to "PART_ScrollViewer" and apply the needed behavior to it.
Please note that the we strongly recommend using Implicit Styles
( and NoXaml assemblies) in the application as this makes such customizations easier.
Hope this will help get started.
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