Andy,

I assume when you say the default button, you are talking about the default button from the Gallery?

I am not certain if you can change the default button from the Gallery. However, there are easier ways to accomplish what you are asking. Add a button to the page which you really want from the Gallery. Don't just take the default. Then, before doing anything with it, like naming, etc. Just copy and paste it as many times as you think you might need it. Then name the new butons as needed.

If you get down to the last blank button on a page and need more, just keep pasting it and new buttons will keep coming.

Dave