C# WPF DataGrid column header style error Cannot find source: RelativeSource FindAncestor

[mojtabahakimian]

Bug explanation

I'm using C# WPF .NET Core 6 also Material Design Theme nuget, I have problem with DataGrid's Column Header Style I have Set a Style for Column Headers of my DataGrid
When I'm trying to enter some data into my DataGrid suddenly I get this error in my XAML (Binding failures) :

HorizontalGridLinesBrush DataGridColumnHeader.BorderBrush Brush Cannot find source: RelativeSource FindAncestor, AncestorType='System.Windows.Controls.DataGrid', AncestorLevel='1'.

GridLinesVisibility DataGridColumnHeader.BorderThickness Thickness Cannot find source: RelativeSource FindAncestor, AncestorType='System.Windows.Controls.DataGrid', AncestorLevel='1'.

After a lot of Debugging I found out if I remove this BasedOn="{StaticResource MaterialDesignDataGridColumnHeader}" from My Style <Style x:Key="CenteryHeaderstyle" TargetType="DataGridColumnHeader" BasedOn="{StaticResource MaterialDesignDataGridColumnHeader}"> It would be fixed !

https://stackoverflow.com/questions/77435140/c-sharp-wpf-datagrid-column-header-style-error-cannot-find-source-relativesourc

Version

4.9.0

[mojtabahakimian]

The problem is if I change this "DataGridColumnHeader" I will get "Error 1 null HorizontalGridLinesBrush DataGridColumnHeader.BorderBrush Brush Cannot find source: RelativeSource FindAncestor, AncestorType='System.Windows.Controls.DataGrid', AncestorLevel='1'."

"Error 1 null GridLinesVisibility DataGridColumnHeader.BorderThickness Thickness Cannot find source: RelativeSource FindAncestor, AncestorType='System.Windows.Controls.DataGrid', AncestorLevel='1'."

[MichelMichels]

Could you provide a test repository?

[github-actions]

This issue is marked stale because it has been open 30 days with no activity. Remove stale label or update the issue, otherwise it will be closed in 14 days.

[MichelMichels]

Closed due to staleness