The control buttons don't actually show up in the markup... I'm sure it's possible to do this, but I can't figure it out. I've tried adding a button, but then I get dupes. I suspect there's a way to set the command name and achieve this, but no luck so far.
I think that when in design view, you can click the little arrow that appears on the top right of the control and convert to a template. This may also be .net version specific.