Hide/Show Dock Icon

I remember seeing somewhere, I think it was here or on Mac OS X Hints, where someone had created an applet that you could use to hide or show a dock icon. I had downloaded it, but I deleted it and can no longer find it. I looked in my TM backups in the applications folder where it was located and it is not there as far back as I can go. Does anyone know of or remember this. I am using a Drobo system and want the Drobo Dashboard app to launch at startup. I have it set in my login item prefs to do so, with it hidden. It works fine, and does not open the app window, so checking the hide box works. It only works to a point, though. As long as the app is running it's icon shows up in the dock. I don't want that there.