As far as the official docs go, it is all hopeless. I have checked all across web, asked chatGpt but no help. I need something like this, for each cell in DataGrid of WinUI 3.
I have tried using DatagridComboboxColumn, but it is NOT searchable. I tried to use '<combobox>' it KINDOF works as its editable but I am not able to Fill the Combobox Items and Bind with Parent DataGrid.
You can use the built-in AutoSuggestBox for this.
If you want the suggestions inside the control itself, I guess you could try the AutoCompleteTextBox (GitHub/NuGet/YouTube).
Disclaimer: I'm the publisher.
<toolkit:AutoCompleteTextBox
IsSuggestionCaseSensitive="false"
SuggestionForeground="HotPink"
SuggestionPrefix="..."
SuggestionSuffix=" ? [Press Right]"
SuggestionsSource="{x:Bind Suggestions, Mode=OneWay}" />