Actually, the best approach is to make a copy of Sitefinity Site Menu
control and modify the copy instead of the original. Thus you will avoid losing the changes in case of upgrade.
Regarding your request to set AccessKey property
through Control Properties window, the solution is to implement your own Control Designer (the properties in the Basic
tab) for the Site Menu
user control. For details how to achieve this refer to the following Developer Manual Topic: Implementing Control Designers
Do let us know if you need any further assistance.
the Telerik team
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