The copyAnchorStyles option of the ContextMenu Widget is not available in MVC wrapper. It's not always suitable to retrieve the anchor style and this option is enabled by default.
I've found a workaround thanks to another thread related to this particular option, but the best solution would have been to be able to set it directly with the wrapper.
The workaround consist to override the default value of this option for all ContextMenu widget (or I believe that's what it does):
Thank you for your time.