My mobile use of RadListPicker displays as a popup (expected -- that is the default). but I never see the buttons that should be at the end of the list, which itself can be fairly long. The documented Footer Template property appears to never have been implemented -- it is not in the metadata for RadListPicker, RadPickerBase, PickerContentView, RadContentView, etc.
I would like to use Telerik's Maui SDK Demo project to see if a workaround exists, but it only builds for Windows. In Android I get the error:
"Error NETSDK1130 Microsoft.Graphics.Canvas.winmd cannot be referenced. Referencing a Windows Metadata component directly when targeting .NET 5 or higher is not supported. For more information, see https://aka.ms/netsdk1130"
As this does not happen in the Cryptocurrency sample (which does not use a ListPicker), I assume SDK has some Windows-specific code that needs replacement.
Even so, the real need is for a GestureRecognizer in the Spinner Control, which does not currently support them. Right now I can tap all I want on an item and the Selected Event never fires. That is understandable, in a way, as documentation says selection only occurs when user "confirms" his choice. Without either a GestureRecognizer or a footer, there is no current way to do that in popup.