2002 Mercury 125 will not go into gear

[magicman1223]

I have a 2001 Tahoe q3 with a 2002 mercury 125 Outboard that was installed when the boat was manufactured. Doesn't make much sense but thats what I was told when I bought the boat. Last summer everything was great except one time I pushed the button to put the motor in "throttle only" and it would not come out of throttle only until I pulled on a little plastic pin that was behind the button for "throttle only" Other then that all last summer everything was great. Today I took the boat out to troll around the lake a little bit and put the boat in "throttle only" this time however it would not come out of it for anything. I remember reading a while back about how some mercury controls had a problem that i am having but I cannot find that information anywhere now. Any help would be appreciated.