Did you try to set the property to the value that doesn't exiist in the combo list?

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>I have a combobox with a value bound to a property. I'd like to be able to start with no value selected. However, I don't have empty value in the list and I do not want to add it there. Is there any way to make it work as I want? Right now it always shows a value even if I try to set ListIndex = 0 and DisplayValue = "".