Thank you for writing.
If you do not have a theme applied, you can change the font size by directly changing the Font property of the RadGridView. In your case, with a theme applied, you have to directly change the font of the tab items. Consider the following code snippet which achieves this:
Font newfont =
RadPageViewStripElement stripElement = (RadPageViewStripElement)
item.Font = newfont;
I hope this will help. if you have further questions, I would be glad to help.
the Telerik team
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