I decided to create this topic to collect useful information, questions and solutions.
First I will discuss my problem.

I need to show/hide this cannon holder, for my TT Knight.

Until wardrobe, I used these commands. This works fine for non-wardrobed models.
[KEY]
<STRING>NAME:HIDE MATERIAL
<FLOAT>FRAME:10
<STRING>LAYOUT:holder
[KEY]
<STRING>NAME:SHOW MATERIAL
<FLOAT>FRAME:15
<STRING>LAYOUT:holder
[/KEY]But it does not work with wardrobe.

(may be necessary to use other names or structure)
I decided to use another method - Particles.
Now I can summon this Holder-Particle when changing weapons, but how to remove it when changing animation?
Earlier, I wanted to use a Particle duration = Animation duration. Like this:
[KEY]
<STRING>NAME:SPAWNPARTICLE_STOP_ON_DEATH
<FLOAT>FRAME:0
<STRING>LAYOUT:media\particles\ttk\c_holder.layout
<STRING>BONE:Bip01 L Hand
[BONEOFFSET]
<FLOAT>X:0
<FLOAT>Y:0
<FLOAT>Z:0
[/BONEOFFSET]
[/KEY]
But today
I found this command:
<STRING>NAME:REMOVEANIMATIONPARTICLESbut have not tried it yet.

Would it work?
but have not tried it yet.
Would it work?
I tried it! Works fine, as I need.

test video:
http://www.youtube.com/watch?v=Ijo93UObXuI&feature=youtu.beSimilar method I suggested to use for the Alchemist - сreate particles "E-gauntlet". This particles could have a different look and depend on the type of weapon (ie. depend on an animation. These E-Gauntlets could look absolutely amazing. Rotating gears/rings/ beams/embers, any color and configuration - it all depends on our imagination).
Regarding my TTK, I still want to find a way to hide/show wardrobe parts.

The reason - the color of the holder, for one particle is always one color.
But it does not work with wardrobe.
Damn, checked again - this works fine!

Looks like I made a mistake somewhere before. Hooray - it solves all my problems!

Now I can make a variety of death - the explosions with disappearing parts!
In any case, we can always continue experimenting with E-gauntlets.
That is pretty neat. I'll have to find an excuse to use this.
Hey Vkoslak. If you will have any questions, I am ready to help. I have some experience with models, wardrobe, etc.