I haven't tried it, but that sounds like it should be the TAB key. But this text box may not recognize the TAB key.
Ok, the tab key will not work in this text box. It switchs you from button to button instead. Also I think this box removes extra spaces unless you use the [pre ] and [/pre ] controls that are for tables. Note, I put a space in the pre and /pre so you could see them you don't want the spaces.
TEST TEST there should be ten spaces between the two tests.