Creating an instance of a nested class in XAML

Question

in a XAML file (a WPF UserControl), is there a way to reference an inner class \"B\" defined in another class \"A\" ?

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Answer 1

. refers to a property; not sure why XAML couldn't also search for a nested class, but it doesn't.

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A nested class can be represented when inside a string (e.g. a property value), using A+B instead of A.B:

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As an element name (as shown in question), + is not allowed, as the result would no longer be valid XML; + is not a valid name character:
XAML is XML.
XML Spec - NameChar.

So the element name cannot directly describe a nested class.
BUT see UPDATE below - an alternative syntax that solves this.

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UPDATE
Per @Artfunkel's comment on one answer, this should be a solution [I have not tested]:

From: https://docs.microsoft.com/en-us/dotnet/framework/xaml-services/x-type-markup-extension

TBD how to specify properties with that syntax. Use x:TypeArguments?