Deriving a Composite Control from a User Control

[Itaichuk]

Hi

I would like to have the flexibility of authoring a user control in
the visual designer as well as having composite control features such
as persisting to dll and toolbox support.

Is it possible/ok to build a Composite Control by deriving from an
existing User Control (.ascx), such that all handling of the UI part
be through the designer ?

Thanks

Itai