Hello,
Welcome to Microsoft Q&A.
RadioMenuFlyoutItem
does not provide properties for setting the check icon.
However, RadioMenuFlyoutItem
belongs to the WinUI project, and its default style definition is not in the generic.xaml provided by the system.
Here is the default style (RS5):
RadioMenuFlyoutItem_rs5_themeresources.xaml
You can copy the corresponding default control template to your project, then modify CheckGlyph
to the specified icon, and reference it in RadioMenuFlyoutItem.
Thanks.
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