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Q: 

How to make editable WPF combobox which only allowed to enter displayed item list?

Hi All,
I have one WPF editable combobox, but I only want user to allow to enter the text which is the start text of the displayed items in the combobox drop down list.
For example, Combobox with the following items,

  • Book
  • Book2
  • Cat
  • Tree

User is only allowed to type B, Bo, Boo, Book, Book2, C, Ca, Cat, T, Tr, Tre, Tree.

Thanks in advance.

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