Hi,
Current UComboBoxString is a joke 
because it doesn’t support localizations and all logic depends on string (FString SelectedOption) it should be uint32. it would be really nice to have in UE4 ComboBox with FText as content.
Regards
Pierdek
Agreed, note: its very easy to create your own version, simply copy the code and create a UComboBoxText 
Besides that the current combobox is quite limited in the sense it doesn’t work well together with keyboard etc.
Hello Pierdek,
I have written up a request and I have submitted it to the developers for further consideration. I have provided a link to the public tracker. Please feel free to use the link provided for future updates.
Link: Unreal Engine Issues and Bug Tracker (UE-40985)
Make it a great day