How did I make this floating window happen?

[paramax55]

A few times, I've pulled down my notifications from the top left corner and I've created this floating window. I can resize it, move it, expand it, and close it, but I can't recreate it at will. How did I do this and how do I make this happen on purpose? I am using Jasmine rom.

 

[zack4200]

swipe in from off the screen at roughly a 45 degree angle directly through either top corner. it seems to be a pretty small activation area