It is a base class that is used by ListBox ComboBox TabControl and others.. Why I cannot derive from it? because for some reason the designers decided to declare few critical functionality as internal . These methods were used in ListBox, ComboBox and TabControl in order to achieve their functionality but yet the designer determined to declare these methods as internal .. WHHHYYY?!!
I don't have the answer. I am deriving from ItemsControl instead.
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