Sao cái Button của mình nó không nhận Style của Material vậy mọi người.

<Window x:Class="TestUI.MainWindow"
        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:TestUI" 
        xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
        TextElement.Foreground="{DynamicResource MaterialDesignBody}"
        TextElement.FontWeight="Regular"
        TextElement.FontSize="13"
        TextOptions.TextFormattingMode="Ideal"
        TextOptions.TextRenderingMode="Auto"
        Background="{DynamicResource MaterialDesignPaper}"
        FontFamily="{DynamicResource MaterialDesignFont}"
        mc:Ignorable="d"
        Title="MainWindow" Height="550" Width="900" WindowStartupLocation="CenterScreen" KeyDown="Window_KeyDown">
    
    <Grid>
        <Button Content="My Button"/>
    </Grid>
</Window>