ActiveX control

I have an activex control that contains a textbox. I want to expose the Scrollbars property to the user. I receive an error that it's read only during run time even though it's being changed at design time on a form (probably because i'm changing it through code). How can I do it, so that it will accept changes at design time??

you can't, because your control is NOT in design time, it is always at run time while being used in another project ;)

the only thing I can suggest is that you have mulitple text boxes (one for each style of scrollbar), then show the appropriate one.