This is an example of a simple custom photo popup, where each photo is enlarged on its own popup layer and activated from the thumbnail image using the standard Xara popup. To synchronise the thumbnail with its popup counterpart, set the target popup layer and the MouseOff layer to visible, make sure no other layers are visible, then drag the required photo from the bitmap gallery over the thumbnail and popup photo; both will be replaced. You can additionally softgroup the thumbnail and its counterpart, thereafter a change in one will change will change the other.