How to change class parent=?koi8-r?Q?=3F?=

Hi,
I'm starting to use smalltalk and i need your help very much.
How can i change my class's parent on another existing one?
Thanks for your help.

If you want a dialog for changing the super class, you can load parcel
RBClassDefinitionTool. It redefines the source tab of the Refactoring
Browser.