Bing map provider does not work over HTTPS due to the fact that the tile images of Bing currently use different URLs for HTTP and HTTPS.
When a user clicks the center button on the separate navigation control (the standard buttons are collapsed) then a line appears at the center-bottom position. Reason for closing/ declining: The separate MapNavigationControl is designed to be used outside RadMap. The bug is only reproducible when the control is placed in the ItemsCollection of the RadMap which is not supported.