Silverlight: How to receive notification of a change in an inherited DependencyProperty

Question

I have a control which inherits from (you guessed it) Control. I want to receive a notification whenever the FontSize or Style properties are chang

Answer 1

This is what I always use (haven't tested it on SL though, just on WPF):

    /// 

    /// This method registers a callback on a dependency object to be called
    /// when the value of the DP changes.
    /// 
    /// The owning object.
    /// The DependencyProperty to watch.
    /// The action to call out when the DP changes.
    public static void RegisterDepPropCallback(object owner, DependencyProperty property, EventHandler handler)
    {
        // FIXME: We could implement this as an extension, but let's not get
        // too Ruby-like
        var dpd = DependencyPropertyDescriptor.FromProperty(property, owner.GetType());
        dpd.AddValueChanged(owner, handler);
    }