There's an issue in IE7 where movement of a view positioned outside the canvas will refocus the iframe in which the app is embedded. Setting clip="true" on any surrounding view into which the outside-the-canvas view is moving seems to fix this.

See bug LPP-3682 for more information. Behavior was witnessed in Calendar demo until clip="true" was set on the view into which infopanel was moving. Prior to this fix, the movement of the infopanel (positioned initially outside the canvas) would refocus the iframe.