I need to create custom context menu items. For example, I need to be able to right click on an image in the editor, and select a custom context menu option, such as "Set Default Image". This option would in turn call a Javascript function, which would add an attribute to the image.

 

Is this possible? 

 

To clarify, I DON'T WANT TO JUST REMOVE EXISTING CONTEXT MENU OPTIONS. I've already viewed the docs for that, and it is not related.