Created Unassigned: WatermarkComboBox shows Item.ToString() instead of "DisplayMemberPath" in selected item [22195]

WatermarkComboBox shows Item.ToString() instead of "DisplayMemberPath" in selected item, which makes it hardly usable.

See also

http://stackoverflow.com/questions/35659604/wpf-how-to-view-a-property-name-in-comboboxitem-list