/// <summary>
///
/// </summary>
/// <param name="unused"></param>
/// <returns></returns>
public bool CanExecute(object unused)
{
return null == canExecute || canExecute.Invoke();
}
/// <summary>
/// Defines the method that determines whether the command can execute in its current state.
/// </summary>
/// <param name="parameter">Data used by the command. If the command does not require data to be passed, this object can be set to null.</param>
/// <returns>true if this command can be executed; otherwise, false.</returns>
public bool CanExecute(object parameter)
{
return(canExecute == null || canExecute.Invoke());
}