How do I style the column header on a UWP CommunityToolkit DataGrid

Question

I'm currently looking at the UWP CommunityToolkit DataGrid. I've been through the docs, but I'm not finding them clear on how to apply a ColumnHeaderStyle. I'm not sure what I should be targeting in the column header to set my style. I'm wishing to change the background and foreground colors. I would also like these properties to apply across the whole header, not just individual columns.

 <controls:DataGrid.ColumnHeaderStyle>
       <Style TargetType="">
             <Setter Property="" Value=""/>
       </Style>                                       
 </controls:DataGrid.ColumnHeaderStyle>

Answer 1

This one had me puzzled for a while, but I eventually discovered you need to add another XML namespace declaration in order to target the column header.

<Application
    x:Class="MyApp"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:controls="using:Microsoft.Toolkit.Uwp.UI.Controls"
    xmlns:controlsprimitives="using:Microsoft.Toolkit.Uwp.UI.Controls.Primitives">

So in this case I just appended:

xmlns:controlsprimitives="using:Microsoft.Toolkit.Uwp.UI.Controls.Primitives"

Then you can create a style with this target:

<Style x:Key="ColumnHeaderStyle" TargetType="controlsprimitives:DataGridColumnHeader">
    <!-- style properties -->
</Style>

(As of writing this, however, there seems to be weird styling behavior in doing this for some reason.)