Found the code for such a ComboBox
http://smfd.ru/blog/wpf-filtered-combobox
created a class with this code. How to use it now? How to place on the form?

  • Well, it also says how to use, open the XAML markup of your window and write in the appropriate place <controls:FilteredComboBox ... , do not forget to connect the namespace controls : xmlns:controls="clr-namespace:MySuperProject.Controls" - Andrei NOP

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