https://learn.microsoft.com/en-us/windows/windows-app-sdk/api/winrt/microsoft.ui.xaml.controls.commandbar.secondarycommands?view=windows-app-sdk-1.8
CommandBar.SecondaryCommands Property (Microsoft.UI.Xaml.Controls) - Windows App SDK | Microsoft...
Gets the collection of secondary command elements for the CommandBar.
windows apppropertymicrosoftuixaml