Trips&Ticks: Do you know how can you obtain access to nested types through XAML?

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XAML is a declarative XML-based language created by Microsoft which is used to initialize structured values and objects. I have already written how we can obtain access to properties of instance that located in other properties here (I have described binding's potential). But what can we do if we need to access to nested type? Which syntax should me use? It is easy: "+" indicates nested type in XAML:

local:MultiLevelButton+NestedInfo.NestedName

A lot of code snippets you can see in sources.