SideButton.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:imp="clr-namespace:GrapeCity.Windows.InputMan.Primitives;assembly=GrapeCity.WPF.InputMan">

    <Geometry x:Key="DownArrowGeometry">M 0 0 L 3.5 4 L 7 0 Z</Geometry>
    <Geometry x:Key="UpArrowGeometry">M 0 4 L 3.5 0 L 7 4 Z</Geometry>

    <Style TargetType="{x:Type imp:SpinButton}" BasedOn="{StaticResource {x:Type RepeatButton}}">
        <Setter Property="IsTabStop" Value="false"/>
        <Setter Property="Focusable" Value="false"/>
        <Setter Property="ClickMode" Value="Press"/>
        <Setter Property="Width" Value="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}"/>        
        <Setter Property="ContentTemplate">
            <Setter.Value>
                <DataTemplate DataType="{x:Type Geometry}">
                    <Path Fill="{TemplateBinding TextElement.Foreground}" Data="{Binding}" 
                          HorizontalAlignment="Center"
                          VerticalAlignment="Center"/>
                </DataTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <Style TargetType="{x:Type imp:DropDownButton}" BasedOn="{StaticResource {x:Type ToggleButton}}" x:Key="DropDownButton_StyleKey">
        <Setter Property="IsTabStop" Value="false"/>
        <Setter Property="Focusable" Value="false"/>
        <Setter Property="ClickMode" Value="Press"/>
        <Setter Property="Content" Value="{StaticResource DownArrowGeometry}"/>
        <Setter Property="Width" Value="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}"/>        
        <Setter Property="ContentTemplate">
            <Setter.Value>
                <DataTemplate DataType="{x:Type Geometry}">
                    <Path Fill="{TemplateBinding TextElement.Foreground}" Data="{Binding}" 
                          HorizontalAlignment="Center"
                          VerticalAlignment="Center"/>
                </DataTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <Style TargetType="imp:DropDownButton" BasedOn="{StaticResource DropDownButton_StyleKey}"/>
</ResourceDictionary>