Hello Eric,
Currently, it is not possible for this aspect of
RadMenu to be customized. However, we internally use timers just as you have suggested and I added this as a feature request. We will consider exposing an API in one of our upcoming releases. I updated your Telerik points for this suggestion.
Should you have any further questions, do not hesitate to ask.
Greetings,
Jack
the Telerik team
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