Issue Seeing IBGateway Window

[afpgit]

First of all, such a great work! I was able to successfully run the docker:

docker run -d --rm --name ibgateway -e ARGS="username=IB_USERNAME password=IB_PASSWORD" -p 5900:5900 -p 7496:7496 -p 7497:7497 ibgateway

It seems like it is running in the background and the API nicely responds to it. However, I can't see IBGateway window as illustrated in the README.md. I have the ENV DISPLAY :0 as ENV DISPLAY :2 since my connection to TightVNC is through :2.

I was wondering if you could help me out.