i have implemented tabs in the caption bar (set in the layout preferences/ main panel config)
i have done basic testing but it needs more testing, so keep a copy of your current version in case you find something you dont like
http://musicbee.niblseed.com/V2/MusicBee_Exe_Patched.zipfor skin creators, a couple of override elements when the tabs are displayed in the caption bar - borders are ignored and set to windows values when displayed in the windows glass area
<element id="TabsBar.TabInCaptionBar.Default" bg="225,225,225" fg="30,30,30" bdr="170,170,170" />
<element id="TabsBar.TabInCaptionBar.Highlight" bg="245,245,245" fg="20,20,20" bdr="190,190,190" />