Declare class namespace in xaml

I have Project H_Pro. There is a user control logistic. In logistic, I have a class GroupingName. How i can declare logistic namespace in logistic xaml and then use this GroupingName class ?

I'm tyring to do this but I cannot.

Can anyone help me?开发者_开发百科

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As far as i am aware you cannot use nested classes in XAML.