>in design time that works fine - but how to let the user change those things?

I knew this question would come :-) I would suggest to build up a form to get the end user preferences (font, size, style and so on) and then apply them to the RichText control programmatically. I remember that when you write an ActiveX control you have the possibility to build a property bag and dialog window to expose the intrinsic properties of your ActiveX control to the user: this is the properties dialog that came up when you right-clicked over the control. Let me check the control I shall find the way to access its intrinsic properties programmatically from VFP.