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Class does not find when using XamlCompositionBrushBase

So, I tried to use BackdropBrush with XamlCompositionBrushBase by creating a BackdropBlurBrush class, but when I call it from XAML it doesn't find the class. I created a class for the main project. See error here .

Example on GitHub: https://github.com/vitorgrs/HostBackdrop/

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Your custom composition brush is not a UIElement

and therefore cannot be placed directly in the visual XAML tree.

Try adding it as a brush for an element -

<Grid>
    <Grid.Background>
        <local:BackdropBlurBrush BlurAmount="5" />
    </Grid.Background>
</Grid>


Usually you want to place your blur brush on top of your background image like this:

<Grid x:Name="Root">
    <Grid.Background>
        <ImageBrush Stretch="UniformToFill" ImageSource="background.jpg"/>
    </Grid.Background>

    <Rectangle>
        <Rectangle.Fill>
            <local:BackdropBlurBrush BlurAmount="5" />
        </Rectangle.Fill>
    </Rectangle>
</Grid>

enter image description here

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