Creating new containers

When you create a new container, that should automatically become selected so you can begin working on it.  Many times I've created a new container, and then realized all that I did was put into the wrong container. 

I've been keeping a library for each song.  And i save instruments in there.  I give the instrument name and the song arrangement #.  Each time a make a few changes I save arrangement again with a numerical value to keep track of things.