I noticed when I save my docking panel layout and then show it again its not remembering which tab in a group of panels that was last on top.  It instead always puts the left most tab on top.  This can be demonstrated by:

1) Start the C# Examples program which comes with the Nevron toolkit

2) Navigate to All Examples -> Docking Panels -> Layout Persistency

3) Press the Launch Example button

4) On the launched window, move one of the Docking Panels with the mouse so it creates two tabs with the Properties list panel.  Make the top tab the right most tab like the screenshot I've attached shows.

5) Select Persistency->Save

6) Select Persistency->Load

Notice how the tab that is on top is not the one it was during the save.  The left most tab (properties list) is instead.  I'm seeing this issue in my program too.  Running on Win7 on build 11.12.14.12.