Shortcut key
As a function that is not included in the standard function of the Next Design extension, it is possible to register a handler for the shortcut key. In the following, when you press the Ctrl + I key, the HelloCommand will be executed. For shortcut keys, use the Register method of ExtensionPoints.ShortcutKeyCommands.
using using System.Windows.Input;
public class SampleExtensionEntryPoint: ExtensionBase
{
    protected override void OnActivate ()
    {
        //Shortcut key registration
        ExtensionPoints.ShortcutKeyCommands.Register <HelloCommand> (Key.I, ModifierKeys.Control);
    }
}