Add ContextMenu to ImageView

I´ve seen in Internal Designer, that ImageView has not the property ContextMenu, then i need to add this by code with ContextMenu and Menuitem objects, but ....

How to add menuitems to a menuitems to create cascading context menu??
How to set the menuitem selected (checked) or not?
How to add separators?
How to set shotrcuts?


Is possible to create a ContextMenu from Json string by code like Internal Designer??

Thanks in advance

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