Upon deeper investigation I noticed that some default apps works & some doesn't. Here is the result so far:
Apps that does NOT move menubar to panel:
1. nautilus
2. gnome-terminal (only shows file>close)
3. gedit
4. file-roller (complete mess: export header-bar menus but also shows menus on the window & a single dropdown menu screenshot: http://i.imgur.com/XDVD9Ei.png)
Upon deeper investigation I noticed that some default apps works & some doesn't. Here is the result so far:
Apps that does NOT move menubar to panel:
1. nautilus
2. gnome-terminal (only shows file>close)
3. gedit
4. file-roller (complete mess: export header-bar menus but also shows menus on the window & a single dropdown menu screenshot: http:// i.imgur. com/XDVD9Ei. png)
5. eog
6. totem
7. mines ( a very big size menu remains on the window screenshot: http:// i.imgur. com/ZD0xma0. png )
8. shotwell
9. transmission
Apps that does move menubar properly to the panel
1. evince
2. rhythmbox
3. disks
4. system-monitor
5. system-log (uses headerbar)