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Provide the support to get the selected value in the MultiColumnDropDown control when binding the base class objects as collection and pass the derived class objects as the data.

Example code
public class BaseClass


public int A{get;set}


public class DerivedClass : BaseClass


public int B {get;set;}


ObservableCollection<BaseClass> data = new 


data.Add(new DerivedClass(){B=10, A=10};

multiColumnDropDownControl.ItemsSource = data;