As PropertyDeifinitions are not visual elements and they are not meant to contain any information about the view, such a change would interfere with RadPropertyGrid's base logic. However, you may try binding the respective PropertyGridField's Visibility property or, as alternative approach, to remove and add PropertyDefinitions at runtime. Would you please share with us what exactly are you trying to achieve so that we could give you some guidelines adapted to your scenario?
the Telerik team
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