scroll through custom palettes?

I've been making custom palettes with the bushes I like from my massive brush collection.  However, some of the custom palettes have a lot of brushes and I can't see them all at the size I made the palette drawer.  I don't want to scale the window to be able to see all the brushes as that would take up too much space.  But, it doesn't seem to have a scroll feature like the regular brush palette. 

Is there a way to allow scrolling in custom palettes?

- Jade Aislin