We may be able to help, but a little more information would be useful.
You mention a Shaw remote "hooked up" to the TV. Do you mean that the Shaw remote can turn the TV power on and off, control the volume and channel?
Does it look like this picture
www.urcsupport.com/index.php ?
If so, we can make it control most (probably all) functions on the TV.
I'd like to know the setup code you are using to control the TV. If you don't already know, use the above link, click on the red letters that say "Atlas DVR-1055", and follow the instructions for blinking back your TV setup code.
If you have that remote, we'll be able to make it work--but you'll have to do some entering numbers on the keypad of the remote.
If you don't have that model remote, you could buy the RCA RCRP05B at Best Buy ($20), or find a used Atlas on the web. Let us know what you have.