Choose an Editor at Runtime

You may want to choose an editor at runtime when:

You do not know the names of properties until you load them. (This is common when using ItemsSource instead of SelectedObject.)
There are runtime conditions which affect the choice of editor. (For example certain properties should be displayed as read-only to users without the Supervisor privilege.)

The three main options are:

As you build the dictionary that will become the ItemsSource, add editors to the Editors collection programmatically.
Put the logic into a DataTemplateSelector or a trigger.
Create a smart editor declaration (a subclass of Editor with a custom CanEdit override).

For more information about these options and how to implement them, see Choosing WPF Property Grid editors from code on the Mindscape blog.