XFEWorkflow

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:controls="using:XFEWorkflow.Controls">
    <Style TargetType="controls:PaneSplitter">
        <Setter Property="HorizontalAlignment" Value="Stretch"/><Setter Property="VerticalAlignment" Value="Stretch"/>
        <Setter Property="UseSystemFocusVisuals" Value="True"/>
        <Setter Property="Template"><Setter.Value><ControlTemplate TargetType="controls:PaneSplitter">
            <Grid Background="Transparent">
                <VisualStateManager.VisualStateGroups><VisualStateGroup x:Name="CommonStates">
                    <VisualState x:Name="Normal"/>
                    <VisualState x:Name="PointerOver"><VisualState.Setters><Setter Target="Grip.Background" Value="{ThemeResource AccentFillColorDefaultBrush}"/></VisualState.Setters></VisualState>
                    <VisualState x:Name="Pressed"><VisualState.Setters><Setter Target="Grip.Background" Value="{ThemeResource AccentFillColorDefaultBrush}"/></VisualState.Setters></VisualState>
                    <VisualState x:Name="Disabled"><VisualState.Setters><Setter Target="Grip.Opacity" Value="0.3"/></VisualState.Setters></VisualState>
                </VisualStateGroup></VisualStateManager.VisualStateGroups>
                <Thumb x:Name="PART_Thumb" IsTabStop="False"><Thumb.Template><ControlTemplate TargetType="Thumb"><Grid Background="Transparent"/></ControlTemplate></Thumb.Template></Thumb>
                <Border x:Name="Grip" Width="2" Height="28" CornerRadius="1" HorizontalAlignment="Center" VerticalAlignment="Center" IsHitTestVisible="False" Background="{ThemeResource ControlStrongFillColorDefaultBrush}"/>
            </Grid>
        </ControlTemplate></Setter.Value></Setter>
    </Style>
</ResourceDictionary>