PMDG 777 Not Work on MCP Combo Original (but 737NGX yes).

HI all:

I have problem with the original MCP Combo. It not works with the PMDG 777. I have the latest version of LInda, but, it is strange cause it works with the PMDG 737NGX. 

I supuse the problem is with PMDG 777. The linda works with other aircraft, but not with the PMDG 777 (and with aerosoft AXXX, in fact). 

I don't know if I have to do anything with the aircraft or in the Linda aircraft setup. 

Any idea.?

Thanks. 

José M. Plasencia.