Popover with MGSplitViewController inside - Orientation Issue

[blub1]

I want to have a Popover with a MGSplitViewController inside and the Orientation Landscape. But when i do that it does hide the Master-View and shows only the Detail-View. I need to have both display (Master & Detail).

I tried some settings and found that when i set
showsMasterInPortrait = YES;
it shows Master & Detail together but the MGSplitViewController width is 768, but the Popover has a width of 1000px.

How can i fix that Issue ?

I wrote the Post already here with some detailed Informations (Pics, etc): http://stackoverflow.com/questions/21754845/popover-with-mgsplitviewcontroller-inside-orientation-issue

Thanks