Easy Dependency Property Question?

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C#

WPF

Hi Guys,

I think this is an easy question - but it's stumped me!

I have a dependency property called 'Location' in a control that wraps google maps. When the map is clicked, I set the property, this works fine. However, when something else sets the property, I need to update the position on the map - how can I know the 'direction' of a dependency property? For example:

OnLocationChanged(DependencyObject o, DependencyPropertyChangedEventArgs args)
{
// if its been set by the click, the map's up to date

// if its been set otherwise, update the map
UpdateMapPosition(args.NewValue);
}

Thanks in advance!!