Designer problem with CompositeDataBoundControl

I have a custom class:

SimpleTemplatedControl : CompositeDataBoundControl

    private ITemplate _itemTemplate;
    [PersistenceMode(PersistenceMode.InnerProperty),
     TemplateContainer(typeof(SimpleItem)),
    ]
    public ITemplate ItemTemplate
    {
        get { return _itemTemplate; }// get
        set { _itemTemplate = value; }// set
    }   

    protected override int CreateChildControls(
        System.Collections.IEnumerable dataSource, 
        bool dataBinding)
    {
        //
    }

When I drop this on a webform I get such a smart tag in which I can choose a DataSource control. Pretty convinient. However if I add this attribute to this class:

[Designer(typeof(SimpleDesigner))]

I don't get to see that anymore but instead a smart tag to fill in my Template (also handy).

I would like to have both option available from within the same smart tag just like with a GridView control. How to accompl开发者_如何转开发ish this?

Which is the Designer type you're using? Normally it would be ControlDesigner but for the CompositeDataBoundControl you should use the DataBoundControlDesigner class to inherit your designer from.

Grz, Kris.