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To add the snap points to the ZoomSnapPoints property at design time, complete the following:
Set the ZoomPreviewMode property to AlternativeContent.
Set the MaxZoomFactor property to 400%.
Set the ZoomSnapDistance to 5%.
Click on the ellipsis button next to the ZoomSnapPoints property.
Click on the ellipsis button next to the ZoomSnapPoints property.
Click Add and set the value to 2.0.
Click Add and set the second member’s value to 3.0.