Finally it semitransparent by Normal Window...
Why Layered won't update itself then?..

I think I'll work around normal window then...
But I need performance benefits...

OMG !!!
All I was needed is Size. Stupid Microsoft says if NULL it hold window size unchanged but it is bu...it!
After I added Size struc to my UpdateLayeredWindow it works just fine.

Thanks for watching

Good work!
У нас скоро будет fasm графический эквалайзер?
Как будешь рисовать GUI под разные размеры экранов и управлять кнопками и sliders?

A lot of ideas: D2D have its own layers to prepare buttons textures there and hold them on right positions. Clicks can be processed by ownerdraw (transparent) childwindows. For best size it is no problem to manipulate with stretch coeficients. Don't look at this rubbish texture it's just for testing windows shadow.
A lot of staff I cleared from render process as BeginPaint, SetWindowLong, etc. Window just flying on the screen, dynamic transparency no need of my attention (redrawing). This benefits we can have with LayeredWindows only. I fixed my hwndRenderTarget too, but it works with normal window only without transparency at all.