Custom command on flight plan dont appear

hello. i want to add a new custom command to plan list .
i obtain the lastest QGC source code from github. I can compile on QTcreator.

I can modify the names and descriptions of command on MavCmdInfoCommon.json file.
But when i add a new entry on this file, the new command dont appear when compile.
Why? I add on qgroundcontrol\libs\mavlink\include\mavlink\v2.0 my custom headers for C language.

can help me?? thanks