Use style trigger to set property of a nested object?

You cannot use Setters like that, if you use this kind of notation the engine will look for an attached property, or if no Style. TargetType was set for a property on the type before the dot.

Try EventTrigger, because other kinds of triggers you could only use in templates or styles. And we already know that Style. Trigger doesn't allow your scenario.

So here is working example for you.

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