[Pharo-project] How to manage removed classes, ScriptLoader and Undeclared ?

Hi guys. It seems when a class is removed, and used by ScriptLoader, it goes to Undeclared, logically. Example: SMxHandMorph was removed. However, ScriptLoader >> update13143 did something with such class. So, now, it is in Undeclared. How can we correctly solve this kind of problem? 1) Always use "Smalltalk at:" and #perform: in ScriptLoader updates? 2) remove those #update methods ? 3) Fix the broken ones by Smalltalk at: a and #perform: ? Thanks -- Mariano http://marianopeck.wordpress.com