Keep Object Visible in world space

Hi,

How can I keep an object visible in world space  after the camera moves away so the target card is no longer in view ?

So for example:  I have a scene with ballons fixed in world space (they do not move)  as the user rotates the ipad away from the target card they can see balloons in world space..   ( imagine seeing  ballons fixed in the air around you )  As the user rotates slowly around with the ipad other ballons slide into frame..  so a user could turns 380 degrees eventually returning to the original target card.

So the traget card is used to trigger the initial objects being rendered in world space and used as a positional reference for baloons in world space not in view.

In the DefaultTrackbleEventHandler.cs   I've tried turning off   OnTrackingLost()

but this only freezes the objects in view, simply sticking them to the camera view. 

UCS allow for mutiple targets or the use of SLAM but I've seen this done simply by recording the target cards world space and using that as a reference.