attachEvent in base class

I have created a base class called Part and inside this class im hooking up a
onclick event to a method called toggleMinimize. If I create a instance of the
Part class all i well.

 However if I inherit from the baseclass Part and create a class called Search
and then create a instance of the search class the event hook-up in the base
class does not work properly. The event is hooked up and everything, but when I
fire the event by pressing the button I get a javascript error "method is
null" or something like that.

 Does anybody know what Im doing wrong? Here are my classes (short version):

 

Type.registerNamespace("Parts");
Parts.Part = function(){
    ... 
     this.initialize = function(){
        ...
        $(oInput).attachEvent('onclick', Function.createDelegate(this,
this.toggleMinimize));
   
     }
     
    this.toggleMinimize = function(){
        alert("hello");
    }
     
    Parts.Part.registerBaseMethod(this, 'initialize');  
}
Parts.Part.registerClass('Parts.Part', null, Sys.IDisposable);

 


Parts.Search = function(){
    Parts.Search.initializeBase(this);
    
    this.initialize = function(partWindow){
        Parts.MapClient.getBaseMethod(this,"initialize",
"Parts.Part")();
    }  
  
}
Parts.Search.registerClass('Parts.Search', 'Parts.Part', Sys.IDisposable);

Hi,

I'm not sure you can pass a string with the name of the parent class. I think
you have to pass a reference to the base class: 

Parts.Search.registerClass('Parts.Search', Parts.Part, Sys.IDisposable);