How to detect playback mode checkboxes in Smart Client?

We have developed a Smart Client plugin which allows the user to export recorded footage from one or more cameras. If you have multiple cameras in the view, the Smart Client displays a checkbox in the top right hand corner of each one.

If there a way through the SDK to determine which checkboxes are ticked? I have seen previous posts relating to this but I have been shown a plugin which appears to do it.

Unfortunately there is no way to detect the check boxes in the playback mode on Smart Client from a MIP plugin.