AutoCad :: Switching Of Layers Including Blocks?

I'm doing very complex drawing of a heating plant on a big ware house site. So I'm using two kinds of layers. I don't know, weather I'm using everything how it is to use or not, because I learned everything by myself.

The first layers are my so called "line type layers": hidden line, center line, wall, border, ... So all the different types of lines I'm using, when is start my drawing. I block all lines, which belong to one part like screws, doors, pips, engines, .. And at the end I put my "part" blocks" on my "part layers", like deashing, ash bin, boiler, building, electrical.

So lets say I have the layer "deashing", which includes several blocks like "deashing screw", "deashing drive", "deashing screw 2", .. And each block consists of several lines, which are on the layers, like "hidden line", "center line" and "black thin line", ...

And now I want to switch of everything in my drawing, which belongs to the "deashing layer" to get a better overview. So I "turn off" the layer "deashing", but I can still see it in my drawing. It just disappears, when I freeze the layer, but it should disappear, when I "turn off" the layer, too, shouldn't it?

So I hope I didn't wrote to much, but I good explanation is worth everything. So why does it not disappear or do I use the layers in a wrong way.