问题
Please see this following image of my datagird.


回答1:
You have to change the DataGrid template, not columnheader. In the default DataGrid template there is:
<sdk:DataGridColumnHeadersPresenter x:Name="ColumnHeadersPresenter" Grid.Column="1"/>
I think you have to edit over there.
来源:https://stackoverflow.com/questions/12420886/style-in-headercolumn-in-datagrid