Hi Massimiliano,
I am afraid that currently the needed approach cannot be easily achieved with RadScheduleView - as you've found we're using the right-click command as well, that's why in your case the context menu cannot be opened.
We're sorry for the inconvenience. We will consider this scenario and will try to find a suitable solution in some of the future versions of RadControls.
All the best,
Yana
the Telerik team