Hi,

I have written a very simple custom control that renders itself as a DIV.
This custom control implements the System.Web.Extensions.IScriptControl
interface.
Here is an extract of the server code:

public partial class MyControl : UserControl, IScriptControl
{
   public override void RenderControl(HtmlTextWriter writer) {
       // Some style attributes are set here
       writer.RenderBeginTag(HtmlTextWriterTag.Div);
       writer.RenderEndTag();
       base.RenderControl(writer);
   }

   protected override void OnPreRender(EventArgs e) {
       if (!this.DesignMode) {
           // Test for ScriptManager and register if it exists
           ScriptManager sm = ScriptManager.GetCurrent(Page);
           if (sm == null)
               throw new HttpException("A ScriptManager control must exist
on the current page.");
           sm.RegisterScriptControl(this);
       }
       base.OnPreRender(e);
   }

   protected override void Render(HtmlTextWriter writer) {
       if (!this.DesignMode) {
           ScriptManager sm = ScriptManager.GetCurrent(Page);
           if (sm == null)
               throw new HttpException("A ScriptManager control must exist
on the current page.");
           sm.RegisterScriptDescriptors(this);
       }
       base.Render(writer);
   }

   public System.Collections.Generic.IEnumerable<ScriptDescriptor>
GetScriptDescriptors() {
       ScriptControlDescriptor descriptor = new
ScriptControlDescriptor("Sample.MyControl", this.ID);
       return new ScriptDescriptor[] { descriptor };
   }

   public System.Collections.Generic.IEnumerable<ScriptReference>
GetScriptReferences() {
       ScriptReference reference =
           new ScriptReference("mycontrol.js");
       return new ScriptReference[] { reference };
   }
}

On the client side, this control has a corresponding javascript class.
In the initialize method, I add a dummy handler on the 'keydown' event
that pops an alert message.
Here is the corresponding javascript code:

Type.registerNamespace("Sample");

Sample.MyControl = function(element) {
   Sample.MyControl.initializeBase(this, [element]);
   this._keydownHandler = null;
}

Sample.MyControl.prototype = {
   initialize : function() {
       Sample.MyControl.callBaseMethod(this, 'initialize');
       this._keydownHandler = Function.createDelegate(this,
this._onkeydown);
       $addHandler(this.get_element(), 'keydown', this._keydownHandler);
   },

   dispose :  function() {
       var elt = this.get_element();
       if (elt) {
           $removeHandler(elt, 'keydown', this._keydownHandler);
       }
       this._keydownHandler = null;
       Sample.MyControl.callBaseMethod(this, 'dispose');
   },

   _onkeydown : function(e) {
       alert('onkeydown');
   }
}

Sample.MyControl.registerClass('Sample.MyControl', Sys.UI.Control);

if (typeof(Sys) !== 'undefined')
   Sys.Application.notifyScriptLoaded();

My problem is while it works well under IE, it does not work in Firefox.
I may surely have done a silly mistake, but I can't find it til now...
Let me know if you need more information.

Thanks for your help,