Default "Weapon menu" reskin?

Hello.
I’ve found that on some servers this menu changed to their super sexy skin:

http://gifok.net/images/2016/03/28/gmodWeaponMenu.png

I used google for few days and don’t found any info which can help me.

Question: How I can change this menu?

You’d basically have to write one yourself from scratch and hide the default one.

That’s what I’m going to do.
But I ask about any hooks, functions, or anything else information about this.
Anyway how I can hide this panel?
I do not even know what it’s called.

It’s very hard to explain thing on English for me, but hope you had a clue.

http://wiki.garrysmod.com/page/GM/HUDShouldDraw to hide it
http://wiki.garrysmod.com/page/GM/HUDPaint to draw it

Alternatively you can use a PANEL for it or something.

http://wiki.garrysmod.com/page/GM/PlayerBindPress to capture keys ( binds slot0-slot9 )