Mitsubishi offline editing

I'm using GX Developer ver 8.25B to edit a program for a Mitsubishi FX2(C). I want to edit the program offline, I'm in write mode but after I change something it turns gray and after pressing F4 (Convert) it says that it can't communicate with the PLC. I don't want to send the changes to the PLC, I just want to edit the program in my computer and download it later. I tried this with other PLC programs and I can edit them offline. The only difference I see is that at the top next the project name it shows LD(R Edit Mode) in the others it shows LD(Edit Mode), without the R. Anyway I don't know how to do this. Any ideas?

Sorry for posting this thread but I already found the answer in this site. I was lazy not using the search function before.
Here is the answer:
http://www.plctalk.net/qanda/showthread.php?t=34100&highlight=mitsubishi+offline+editing

Many before you have been stumped with that one, its a common problem.
And the fix is hidden away a little too well.