CheckBox

How to bind checkBox with two storyboards, so that when I click the checkbox start the second storyboard? first storyboard I have a car that runs on the road, while the second storyboard should do the same car that runs on a black surface, it should be going after the same street except that reduce the opacity to 0.

Write a seperate function to start a second storyboard with necessary information.
Call this function in the check box checked changed event
 
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thanks
vr
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write two functions, but when start the project only my first storyboard is executed


public partial class MainWindow : Window
  
 {
        public MainWindow()
        {
            this.InitializeComponent();

            // Insert code required on object creation below this point.
        }
        private void ckBox_Unchecked(object sender, System.Windows.RoutedEventArgs e)
        {
            Storyboard st = Resources["stplus"] as Storyboard;
            st.Begin(this, true);
        }

        private void ckBox_Checked(object sender, System.Windows.RoutedEventArgs e)
        {
         Storyboard st = Resources["stminus"] as Storyboard;
            st.Begin(this, true);
        }
    }
}