[2005] Design time support for exposed UpdatePanelTriggerCollection

I've got a webusercontrol that has an an UpdatePanel. I'm exposing it's triggers property as below:

Code:

---

[MergableProperty(false),
        Editor(typeof(System.Web.UI.Design.UpdatePanelTriggerCollectionEditor), typeof(UITypeEditor)),
        PersistenceMode(PersistenceMode.InnerProperty),
        Category("Behavior")]
        public UpdatePanelTriggerCollection Triggers
        {
            get { return UPDisplay.Triggers; }
        }

---

I've tried declaring this with only the Browsable(true) attribute also.

If i try it with just the Browsable attribute then when the triggers collection editor comes up it doesn't let me choose to add an AsyncPostbackTrigger, or a full postback trigger, it just tries to create the abstract base class - so it errors.

When i try declaring it as above i get an error "Value cannot be null, parameter name: component" when trying to open the editor.

I can manually add triggers in the markup, but i'd like editor support if possible. Any help would be much appreciated.