Impossible to answer without knowing what textbox you are referring to.
If it is your add-ins own textbox, you can indeed control the text font and colour.
If it is part of the built-in Revit functionality, you probably cannot (easily).
Impossible to answer without knowing what textbox you are referring to.
If it is your add-ins own textbox, you can indeed control the text font and colour.
If it is part of the built-in Revit functionality, you probably cannot (easily).