There are codes that go directly to the assigned app. Meaning "One IR Code" and it will jump to the app.
You just need to purchase the UEI remote that Edmond mentioned in his post, learn those codes into your MX880! You do not use the UEI remote in your system, you use it as a tool to program your MX880.

I'm not sure how to make it any clearer than that.
You do not need to do it the way you are doing it.

[edit]:
I went back and re-read your posts. It appears some of the problem is, you don't know how to fully program your MX880 properly? You are going to need to learn the software some, before getting this right. There are programming guides under the 'help' tab in the software.