Does anyone have an app that uses remmina to create an RDP connection from OpenOndemand to a windows desktop?

I am in need of an app that will use the remmina package to create a Remote Desktop connection to a windows desktop. I believe I need to use the gtk3 gem to get the window to open up on the Ondemand Server but I do not know how to do that. I’ve looked at using Passenger to do this but I keep running into errors with gtk and a simple test window without using remmina.

Remmina needs a window manager so I did this through vnc.