Generally when I work with the textures/shaders, I do it one at a time.  Unless there are portions I want to copy/paste, then I leave the two open and close the second to open the next.  It may seem tedious, but it's six of one and a half-dozen of the other really.  For me, it's just easier to keep control of what I'm doing and the useage of the system's memory to keep it that way.