The on-screen remote has a lot more to do with the specific device being controlled than with your service provider. Look around in there and see if you can find something intended for the make/model of your DVR box. For example, if your TELUS box is a Scientific Atlanta Explorer 8300HD, look for that.
If your box is too new to have made the supported list, you'll have to wait. Or, you might be able to create a custom one for it. Have a look here:
Once created (or if you find an already built custom remote), here's a link to some installation instructions:
Hope this helps !