Can't assign hot key to pose and particles edit mode

Hi, I’m trying to assign keys to each mode (F1, F2, F…) but it does not work for pose mode and particles edit mode.

I’m going to ‘user preference > input > Object Non-modal’ and selecting the mode for each key, but when I click the drop downl menu to select the mode, the first time pose mode and particles edit mode don’t appears, then I select any mode and click again and then all mode appears.
But when I select those two mode and save, it doesn’t work (keys do nothing). And if I go back to user preference, for these two keys the mode is blank.

Is it a bug or is there a reason for that ?

Thanks

Particle Edit mode will only work when you have selected an object with a particle system and pose mode when you select an armature.

Also check for any conflicts with other operations that may use the same shortcut

I had to be tired yesterday, yes I was just not selecting the armature testing all my button, same thing for the particles… thanks