Mode dial lock button and plate fell off

[fragglecasper]

On my canon 6d I have noticed the mode dial and the lock button has fallen off. How I do not know,
I have replaced the mode dial plate before simply by using double side sticky tape,but I have never had the lock button come.out.
I have purchased a whole new dial and it will arrive in a week or so,

My question is has the lock button ever popped out on anyone and is it just a push back in piece or does it need to go for repair.
The whole dial is still in place,and by the look at the part it does look like it is a.push down into the dial.
Then secure the dial.plate. ?

And info would be great.
Canon 6d.