This is rather delicate case, if you want to rotate the header text it is quite simple to edit the template of GridViewHeaderCell and rotate the ContentControl named ContentPresenter to the specified angle. If you do that you will see that the text is cut. So that you should adjust not only the ContentPresenter, but you should also adjust the whole structure of the GridViewHeaderCell,GridViewHeaderRow and RadGridView. I have prepared an example for you that demonstrates this approach.
Please check the attached project and if you need any further assistance let me know.
Best wishes,
Vanya Pavlova
the Telerik team
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I had a look at this example. It addresses all columns of a grid. Is there a way to apply the rotated style only to a selected number of columns?
Thanks,