WPFでResourceDictionaryを使い共通のスタイルをテーマファイルとして集約する。

    <!-- MayworkTheme.xaml -->
<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <!-- ============================= -->
    <!-- 基本単位（4px基準） -->
    <!-- ============================= -->

    <Thickness x:Key="SpacingSmall">4</Thickness>
    <Thickness x:Key="SpacingNormal">8</Thickness>
    <Thickness x:Key="SpacingLarge">16</Thickness>

    <!-- ============================= -->
    <!-- デフォルトフォント -->
    <!-- ============================= -->
    <Style TargetType="Control">
        <Setter Property="FontFamily" Value="Yu Gothic UI"/>
        <Setter Property="FontSize" Value="13"/>
    </Style>



    <!-- ============================= -->
    <!-- 共通コントロール -->
    <!-- ============================= -->

	<!-- Window -->
	<Style TargetType="Window">
		<Setter Property="Padding" Value="8"/>
	</Style>
	
	<!-- TextBlock -->
    <Style TargetType="TextBlock">
        <Setter Property="FontFamily" Value="Yu Gothic UI"/>
        <Setter Property="FontSize" Value="13"/>
    </Style>

    <!-- Button -->
    <Style TargetType="Button">
        <Setter Property="Margin" Value="4"/>
        <Setter Property="Padding" Value="8,4"/>
        <Setter Property="MinHeight" Value="28"/>
    </Style>

    <!-- TextBox -->
    <Style TargetType="TextBox">
        <Setter Property="Margin" Value="4"/>
        <Setter Property="Padding" Value="6,4"/>
        <Setter Property="MinHeight" Value="26"/>
    </Style>

    <!-- Menu -->
    <Style TargetType="Menu">
        <Setter Property="Margin" Value="0"/>
    </Style>

    <!-- StatusBar -->
    <Style TargetType="StatusBar">
        <Setter Property="Padding" Value="4"/>
    </Style>

    <!-- ScrollViewer -->
    <Style TargetType="ScrollViewer">
        <Setter Property="HorizontalScrollBarVisibility" Value="Auto"/>
        <Setter Property="VerticalScrollBarVisibility" Value="Auto"/>
    </Style>

	<!-- Grid -->
	<Style TargetType="Grid">
		<Setter Property="Margin" Value="8"/>
	</Style>

	<!-- StackPanel -->
	<Style TargetType="StackPanel">
		<Setter Property="Margin" Value="8"/>
	</Style>

	<!-- Panel -->
	<Style TargetType="Panel">
		<Setter Property="Background" Value="Transparent"/>
	</Style>

	<!-- 特化コントロール -->

	<!-- 水平スタックパネル -->
	<Style x:Key="HorizontalStackPanel"
       TargetType="StackPanel">
    <Setter Property="Orientation" Value="Horizontal"/>
	<!--
	使い方
		<StackPanel Style="{StaticResource HorizontalStackPanel}">
			<Button Content="OK"/>
			<Button Content="Cancel"/>
		</StackPanel>
	-->



</Style>
</ResourceDictionary>

<!--
// 使い方

App.xaml
<Application.Resources>
	<ResourceDictionary>
		<ResourceDictionary.MergedDictionaries>
			<ResourceDictionary Source="Themes/MayworkTheme.xaml"/>
		</ResourceDictionary.MergedDictionaries>
	</ResourceDictionary>         
</Application.Resources>
-->