Maintain the Relative Control's Position in WPF

I have a Canvas in which I have some UserControls.

You can imagine it as a Map with city points.

Say, the canvas size is 100x100. Say I have only two UserControls A (10, 20)开发者_如何学Python and B (50, 50).

Now, user resizes the canvas to 1000x1000.

Is there a way to keep the UserControls at the same scale: A(100, 200) and B(500, 500) WITHOUT cycle all the controls and updating its individual positions to the manually calculated new ones.

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You might want to take a look at my answer to this post. If you have lat/longs for your cities it's ideal. If not, it sounds like you'd be best writing your own panel that uses relative coordinates rather than absolute.