Hi Stoitcho
Sorry for the confusion, it's a bit hard to get my requirements down on paper!

The question is how to display an object's property (called MyCollection
say) where the MyCollection property is a class implemented as follows:

class MyCollectionClass : IDictionary<string, MyObjectType>

so that when the object is displayed in the property grid the user can
expand the MyCollection property with say an ellipsis button and then add and
remove objects of the type specified by IDictionary<key, MyObjectType> and
set their values in a manner similar to that had I used List<MyObjectType>
for example.

My current line of attack is as follows:

[Editor(typeof(MyCollectionEditor),
typeof(System.Drawing.Design.UITypeEditor))]
       public MyCollectionClass

and then in MyCollectionEditor to the override GetEditStyle and EditValue
and to display a custom form which allows the user to edit the collection and
its contents.  The second question therefore is is this approach the right
one in a .NET2 world?

I hope this makes sense.

Marek