You do not need to use a selector and manually apply an item template depending on whether your MenuItem has submenu items or not. RadMenu takes care of this automatically.
If you need to use only the default template for RadMenuItem, you can copy the SubMenuItemTemplate
and customize it per your requirements.
If your menu ever includes hierarchical items, you will need all four templates for your changes to get applied. I suggest that you use the implicit RadMenuItem style found in the suggested location on your machine and apply it as an ItemContainerStyle
including all four templates that it has a reference to.
Hope this helps.
All the best,
the Telerik team
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