Setting a style’s TargetType property to a base class

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Unfortunately, you cannot apply styles to the base FrameworkElement type; while WPF will let you write the style, it will not apply it to the controls that derive from it. It appears that this also applies to subtypes of FrameworkElement, e.g. ButtonBase, the supertype of Button/ToggleButton/RepeatButton.

You can still use inheritance, but you will have to use the explicit BasedOn syntax to apply it to the control types you want it to apply to.

<Window.Resources>
    <Style TargetType="{x:Type FrameworkElement}">
        <Setter Property="Margin" Value="10" />
    </Style>

    <Style TargetType="{x:Type Label}" BasedOn="{StaticResource {x:Type FrameworkElement}}" />
    <Style TargetType="{x:Type TextBox}" BasedOn="{StaticResource {x:Type FrameworkElement}}" />
    <Style TargetType="{x:Type Button}" BasedOn="{StaticResource {x:Type FrameworkElement}}" />

</Window.Resources>

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