docs-desktop/dotnet-desktop-guide/net/wpf/controls/snippets/how-to-create-apply-template/csharp/Window3.xaml

<Window x:Class="IntroToStylingAndTemplating.Window3"
        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:IntroToStylingAndTemplating"
        mc:Ignorable="d"
        Title="Window3" SizeToContent="WidthAndHeight" MinWidth="250">
    <Window.Resources>
        <!--<SnippetControlTemplate>-->
        <ControlTemplate x:Key="roundbutton" TargetType="Button">
            <Grid>
                <Ellipse Fill="{TemplateBinding Background}" Stroke="{TemplateBinding Foreground}" />
                <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
            </Grid>
        </ControlTemplate>
        <!--</SnippetControlTemplate>-->
    </Window.Resources>
    <Grid>
        <!--<SnippetStyledButton>-->
        <StackPanel Margin="10">
            <Label>Unstyled Button</Label>
            <Button>Button 1</Button>
            <Label>Rounded Button</Label>
            <Button Template="{StaticResource roundbutton}">Button 2</Button>
        </StackPanel>
        <!--</SnippetStyledButton>-->

        <!--<SnippetStyledButtonSize>-->
        <StackPanel Margin="10">
            <Label>Unstyled Button</Label>
            <Button>Button 1</Button>
            <Label>Rounded Button</Label>
            <Button Template="{StaticResource roundbutton}" Width="65" Height="65">Button 2</Button>
        </StackPanel>
        <!--</SnippetStyledButtonSize>-->
    </Grid>
</Window>