Hey !!

i had the same problem , but in your code : 
heading.addEvent('click', function(){
  // yada yada
  this.hideAll(i); -- 'this' is not the class , but rather the button !!
  // yada yada
}); 

to solve it , you have a few options : 
1.    use that variable .

// saving the this in a variable before we create the callback function .
var that = this;
heading.addEvent('click', function(){
  // yada yada
  that.hideAll(i); // now that is know in the function , and its basicly 
your callback 'this'
  // yada yada
}); 

2. if you do something with the 'this' - you can use the call function .

var that = this;
heading.addEvent('click', function(e){
  // use the this which is the button if needed.
    this.do_something_of_button();
  that.hideAll.call(that,e); -- the hideAll function will run , and inside 
it the 'this' is the that you gave in the first argument ! 
  // yada yada
}); 

On Wednesday, September 12, 2012 11:06:24 PM UTC+3, Douglas Machado wrote:
>
> Greetings,
>
> I'm having a hard time to make a method to work correctly and I appreciate 
> if anyone could help me out;
>
> I have uploaded the script to this JSFiddle:
> http://jsfiddle.net/machadoug/LPVkv/1/
>
> It is not executing this method below
> this.hideAll(i);
>
> Also, if I uncomment this.setOptions() I get this error in Firebug's 
> console:
>
> TypeError: this.setOptions is not a function
>
>
> Thanks in advanced for your help,
>

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