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Could you clarify if on iphone5 if you are testing as a native app. The screenshot illustrates use of a GotoURL action with the native popup options set. If you are running in a browser, then the native behaviors do not apply and you can only open the url in a new browser window or replace the current browser content with the url.
It sounds like you are running this as a webapp, not a native app. For a native app you need to publish it with the Apple Developer Certificate and Provisioning file. Are you registered as an Apple Developer? If so I can point you to some info on how to do this.