How to bind a ButtonAssist CornerRadius Value of Material Design from a source

Question

I'm using C# WPF with Material Design .

What I need :

I'm trying to set CornerRadius of ButtonAssist for any Button in my project.

Problem:

I can't set this property from Application.Resources.

My XAML :

<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:MaterialDesignation"
    xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
    x:Class="MaterialDesignation.MainWindow"
    mc:Ignorable="d"
    Title="MainWindow" Height="450" Width="800">
<Window.Resources>
    
</Window.Resources>
<Grid>
    <!--I Want to Set Radius For All Buttons in My Projects like blow line ↓-->
    <Button Content="Button" materialDesign:ButtonAssist.CornerRadius="30" HorizontalAlignment="Left" Margin="71,260,0,0" VerticalAlignment="Top" Width="237" Height="85" Background="#FF038BEA" BorderBrush="{x:Null}"/>

    
    <Button Content="Button" Style="{StaticResource ResourceKey=Gerdy}"  HorizontalAlignment="Left" Margin="410,129,0,0" VerticalAlignment="Top" Width="237" Height="85" Background="#FF038BEA" BorderBrush="{x:Null}"/>
    <Button Content="Button" materialDesign:ButtonAssist.CornerRadius="{Binding Gerdy}" HorizontalAlignment="Left" Margin="71,129,0,0" VerticalAlignment="Top" Width="237" Height="85" Background="#FF038BEA" BorderBrush="{x:Null}"/>

</Grid>

My App.xaml :

<Application x:Class="MaterialDesignation.App"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
          xmlns:clr="clr-namespace:System;assembly=mscorlib"
         xmlns:local="clr-namespace:MaterialDesignation"
         xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
         StartupUri="MainWindow.xaml">
<Application.Resources>
    <ResourceDictionary>
        
        <Style x:Key="Gerdy" TargetType="{x:Type Button}">
            <Style.Resources>
                <Style TargetType="{x:Type Button}">
                    <Setter Property="materialDesign:ButtonAssist.CornerRadius" Value="30" />
                </Style>
            </Style.Resources>
        </Style>

        <clr:Byte x:Key="GerdyAsByte">30</clr:Byte>

        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml" />
            <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" />
            <ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Primary/MaterialDesignColor.DeepPurple.xaml" />
            <ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.Lime.xaml" />
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>

Here is my full WPF project link : https://ufile.io/gt5dcjzh

Please help