Style class for AvatarView.

[OudomMunint]

How do I create a style class for an AvatarView? I have a few properties used in a few different avatar views that I'd like to condense into a single style class. I've tried the below code but none worked.

 <Style x:Key="CustomAvatar" TargetType="toolkit:AvatarView">
 <Style x:Key="CustomAvatar" TargetType="Frame">
 <Style x:Key="CustomAvatar" TargetType="Border">