Flickr: Application's main page cannot adaptive device's screen size automatically

Application's main page cannot adaptive device's screen size automatically when opening the application by QMLViewer.

Reproduction Steps:
1. launch QMLViewer then execute flickr.qml file
2. wait network to download pictures,watch the application's main page size.
3. select "Help->About Qt" from the menu,then click "OK" button,watch the application's main page size.

Expected Result:
In step2,the application's main page is full size in the screen,the buttons "Update" and "View mode" are available.

Actual Result:
In step2,the application's main page is not full size in the screen, and the buttons "Update" and "View mode" are hidden in the Status Bar, cannot do any testing.
In step3,the application's main page is full size in the screen, and the buttons "Update" and "View mode" are available.

Actually, all the applications of declarative testing exist this problem, some of the application's buttons are hadden in the Status Bar.

More information in private JIRA:https://qtrequirements.troll.no/browse/QT-4824