PresetsWindow : unable to override

[strobotone]

Is there a way to override the default PresetsWindow style?
I did a ControlTemplate within the ParameterWindow.xaml and addressed it with : TargetType="{x:Type l:PresetsWindow}"
(since it is a childwindow) but that does not work.

[oskari]

x:Key="{x:Type l:PresetsWindow}" TargetType="{x:Type l:PresetsWindow}"

Setting Key to the type overrides the default style.

[strobotone]

Yes, it should. But for some reason it does not.
Also tested outside ParameterWindow.xaml.
Not even setting "OverridesDefaultStyle"="true" makes a difference.