from couple of hours I try figureout how vertical drop down works. Maybe somebody will be so nice and explain my what Iam doing wrong. 
I would like to achive vertical dropdown menu like is [here](http://bootstrapmaster.com/live/simpliq2/index.html).
When you click on eg 'UI Features' the sub menu roll down and move other elements down. 

I tried couple of solutions but it still doesnt work. My dropdown appear above other elements.

Here is what I achived [Codeply](http://www.codeply.com/go/9YoqUZccbt) 

Ps: I using Bootstrap v3.3.2