This is sure odd. Sure enough, it doesn't seem to like the \t. It gives a funny little | I don't think this is a bug, because I think it would have given me an error, instead of popping that odd character up there. What is strange, I checked in the help, and once the project is "running", you are able to go into the text box, and press to insert spaces up to the next four character tab stop. So there seems to be tab presets in there. I know who I can talk to about this, but they are gone on vacation until next year. I will check it out, and post back to here once we get this cleared up. Good eye.
You can do a shift-tab when you are setting the text box up yourself from the .uir file to get a four space indentation. Were you hopding to do something like this?