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It is currently not possible to style a custom subclass differently than the bound base class.
This is because the Appearance method is static, and the base class cannot know if the Appearance property was called on from a derived class or not.
One possibility is to introduce a method allowing you to specify the subclass:
public static UISlider.UISliderAppearance GetAppearanceForSubclass (Type subclass)
See this for context (and an ugly workaround): http://forums.xamarin.com/discussion/1552/uiappearance-on-a-subclass-affects-the-base-class
Note that the final solution is to do this:
UICustomClass.GetAppearance<UICustomClass>.Property = ...