assigning value to URL of scriptlet control

[Lothar Haensler]

whenever I try to assign a value to the URL property of a Microsoft Scriptlet control through code (i.E. scr.URL = "...") I get an error message "object doesn't support this property or method".
It's no problem to assign an URL at design-time in the properties box for the control.
But, I want to be able to assign this value at runtime.

Any hints?