Vertical separator in WPF Ribbon
This is how I would do it.
<ribbon:RibbonGroup.Resources>
<!-- Vertical Separator-->
<Style TargetType="{x:Type ribbon:RibbonSeparator}"
x:Key="KeyRibbonSeparatorVertical">
<Setter Property="LayoutTransform">
<Setter.Value>
<RotateTransform Angle="90"/>
</Setter.Value>
</Setter>
</Style>
</ribbon:RibbonGroup.Resources>
It looks like this doesn't work in the latest version (3.5.40729.1) anymore. The RibbonSeparator also doesn;t work, but you can use:
<Ribbon:RibbonControlGroup Height="55" Margin="5" Width="1" MinHeight="55" MaxWidth="1"/>