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c#wpftriggersfindancestor

WPF Triggering by ancestral property

I would like to use a trigger, but need to select the ancestor's property, for example:

<Trigger Property="State" Value="Expanded">
   <Setter Property="Background" Value="Red" />
</Trigger>

Only that the State property need to be the property of an unknown ancestor by a known Type and if could not be found then trigger would never execute.

So my question is how can I find the ancestor to get the property to use in the trigger?

Hope I made myself clear. Thank you in advance.

Solution 
  • <DataTrigger Binding="{Binding State, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Whatever}}}" Value="Expanded">