A customised editor for a component..?

OK - I am building a couple of windows forms components, one which provides text styles (like the header/subheader/ etc. stuff in MS Word) and another which allows you to build structured print documents....

However I am not able to attach the component designer to the component.
(full code attached)

So - I have a class that inherits from WindowsFormsComponentEditor:

VB Code:

Public Class DocumentParagraphTextStylesEditor
    Inherits WindowsFormsComponentEditor
 
#Region "Overrides"
    Public Overloads Overrides Function EditComponent( _
                 ByVal context As ITypeDescriptorContext, _
                 ByVal component As Object _
                 ) As Boolean
 
        If Not ((context Is Nothing) OrElse (context.Instance Is Nothing)) Then
            If TypeOf (component) Is TextStyleProvider Then
                '\\ Show the Form_TextStyleEditor
                Dim fEdit As New Form_TextStyleEditor
                If TypeOf (component) Is TextStyleProvider Then
                    fEdit.TextStyles = CType(component, TextStyleProvider).DocumentTextStyles
                    With CType(context.GetService(GetType(IUIService)), IUIService)
                        If .ShowDialog(fEdit) = DialogResult.OK Then
                            CType(component, TextStyleProvider).DocumentTextStyles = fEdit.TextStyles
                            Return True
                        Else
                            Return False
                        End If
 
                    End With
                End If
            End If
        End If
 
    End Function
#End Region
 
End Class

...and I have attached this to the component itself thus:-

VB Code:

<ToolboxBitmap(GetType(StructuredDocuments.TextStyleProvider), "TextStyleControl.bmp"), _
     EditorAttribute(GetType(StructuredDocuments.DocumentParagraphTextStylesEditor), GetType(WindowsFormsComponentEditor))> _
    Public Class TextStyleProvider
        Inherits System.ComponentModel.Component
'--8<--------------------------------
   End Class

However nothing happens - the component still tries to use the standard collection editor (with ghastly results).
Any ideas? or pointer to working code sample?

Are you having the problem at run time or design time where it's not showing the editor correctly?

At design time.
Add a "TextStyleProvider" component to a form and select properties. Then press the button next to the property "DocumentTextStyles" and you should get a nice designer (like shown) but instead a default collection editing window comes up...?