IsInDesignMode for WPF and Silverlight

Here is the proper way to check for IsInDesignMode for WPF and Silverlight which works for both Blend and Visual Studio.

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public class Bootstrapper
{
    private static bool? _isInDesignMode = null;

    /// <summary>
    /// Returns a boolean value whether the code is currently running in design-mode.
    /// This check works for both SL and WPF inside Blend and Visual Studio.
    /// </summary>
    public static bool IsInDesignMode
    {
        get
        {
            if (_isInDesignMode == null)
            {
                string app = Application.Current.ToString();
                if (app == "System.Windows.Application" || app == "Microsoft.Expression.Blend.BlendApplication")
                {
                    _isInDesignMode = true;
                }
                else
                {
                    _isInDesignMode = false;
                }
            }

            return _isInDesignMode.Value;
        }
    }
}