If the ContextMenuStrip has to replace the ContextMenu control, I'm missing something behind the scenes, because I can't find the Popup event. Is there any other event I can use in its behalf?

I think you're looking for the Opening and Opened event.

Yes, you're right. I found the Opened event, but not the Opening event. I need an Opening event (or the former Popup) because I'd like to be able to enable/disable some menu items of the menu just before rendering the context menu. I think that when you received the Opened event, the context menu has been already rendered on the screen, isn't that so?

The Opening (and Closing) events were added after Beta 1. Look for them in future community drops.