https://learn.microsoft.com/en-us/dotnet/api/system.windows.controls.itemscontrol.itemssource?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0&redirectedfrom=MSDN
ItemsControl.ItemsSource Property (System.Windows.Controls) | Microsoft Learn
Gets or sets a collection used to generate the content of the ItemsControl.
property systemitemssourcewindowscontrolsmicrosoft
https://learn.microsoft.com/en-us/dotnet/api/system.windows.controls.itemscontrol.itemssource?view=windowsdesktop-10.0&redirectedfrom=MSDN
ItemsControl.ItemsSource Property (System.Windows.Controls) | Microsoft Learn
Gets or sets a collection used to generate the content of the ItemsControl.
property systemitemssourcewindowscontrolsmicrosoft