I understand that you are having some issues in order to control your Dish Network DVR with your Slingbox since it is a dual tuner DVR.
The main issue is that the Slingbox will work only with the TV1 option since it only recognizes the IR commands. If you try to hook it up with your TV2 option (which is RF), it will not work. In this case, you'll need to connect your Slingbox to TV1 and the TV set to the TV2 option. This is the only way the Slingbox will work in a proper way with your DVR.