Hello Ole,
you can put an instance of that style in the App resources, for example:
and then use it where you need to via StaticResource markup extension.
Important Note
Keep in mind that this resource is an
instance of an object (
a DataGridColumnHeaderStyle object) and not a template, so you can't reuse it across multiple columns at the same time. If you do need a style for multiple columns then you can use multiple style instances.
Regards,
Lance | Tech Support Engineer, Sr.
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