Yes, I suppose in the case of a gallery with many images that would be less than optimal. Actually, you can animate the pan and zoom image itself. You can create your own custom control that will aggregate PanAndZoomImage. Internally, you will wait for the image to be downloaded or opened and then you can animate the pan and zoom image. After the animation is finished you can allow the pan and zoom image to listen for user gestures. Finally, in your image list you can use the custom control as the data template for your images.
This way you will not have to dynamically add, remove or tweak any external elements.
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