Assign F5 TO FORMAT / SIZE TO FIT in VBE /Visual basic editor/

Hello, everybody!

Since this issue is important to me, I made an effort to come up with something. 
I offer you my solution. Surely there can be better ones.

Here's how we're going to make Alt-B perform the "Size to fit" operation in VBEditor

1. We create our own "Size to fit" button in a new or existing button bar.
2. Change button name to Size to fit &B or Any Name &B
3. Style of button must be Text only (always) or Image and text. If no text on Button caption hot key Alt-B don't work, because &B not exist in caption.

Ready!

Important!
VBE Root menu - File Edit View etc. have hot keys Alt-F Alt-E Alt-V respectively
No two menus should have the same hotkeys.
If there are, then for both the hotkey will not work.
For this reason I have chosen the Alt-B hotkey to run Size to fit command

Two problems remain to be solved:

1. How do I get F5 to do Size to fit, but as long as Alt-B does it's not a big problem.
2. How do I make pressing a function key or key combination in VBE run a macro.
Any idea in this direction will be gratefully received.

Greetings!