/// <summary>
/// Initializes the singleton instance of the command.
/// </summary>
/// <param name="package">Owner package, not null.</param>
public static async Task InitializeAsync(SimpleStateMachineEditorPackage package)
{
// Switch to the main thread - the call to AddCommand in AddStateCommand's constructor requires
// the UI thread.
await ThreadHelper.JoinableTaskFactory.SwitchToMainThreadAsync(package.DisposalToken);
OleMenuCommandService commandService = await package.GetServiceAsync(typeof(IMenuCommandService)) as OleMenuCommandService;
Instance = new AddStateCommand(package, commandService);
}