The sidebar is only avaible with columns UI (developed by musicmusic, official webpage ). If a lot of people use it above their playlist, it is still an anormal use of it, it's normal place is on the left. The abilities of this component is not extraordinary in itself but it will allow you to use some very interesting components. I won't describe all of them as it is quite hard to enumerate them, I will just say a few words about the more used ones.
The Toolbar is for its part quite functional. With some components, you can transform it into a tiny powerful console.
Just remember that adding the components described below will probably increase the CPU usage by foobar, as a consequence, take care ta add only the useful ones (for you) /
Show toolbars: Hide or shows the toolbars (playing order, playback buttons) See here for more details.
List all toolbars: will list all the toolbar avaible.
Use custom buttons: Just select some buttons. (Some are avaible from here). It needs a restart from the user to take effect.
Bitmap includes mouseover images: use if in the file there is not only the standard buttons but also the buttons when your mouse is over them. (if there are 7 buttons, do not use it, if there are fourteen, use it)
Make bottom left pixel transparent (8bit or less color depth bmp only): Use it to have some transparency.
Use system menu height:
Disable default drawings: Not using this option, the software will outline buttons, else, it will only show the drawings.
Visualisation frame: Choose the kind
Reset toolbar: will return to default settings
Enable sidebar: use it to have the sidebar avaible
Autohide sidebar: Use it to hide automatically your sidebar (when it is empty for example)
Create toggle area to left of sidebar: If you use it, clicking on the extreme left of the sidebar will make it appear or disappear.
Use custom show delay of:
Hide delay: Choose how long the sidebar will appear before hiding (use it with autohide sidebar)
Reset: Go back to default settings
It couldn't be more simple, you just need to right click on the corresponding place: in the sidebar for the sidebar, at the top of your screen for the toolbar.
To set the panels above your playlist, go to : Preferences,Display,columns UI, "Other" tab, use :list all toolbars, then add the panels/toolbars/visualiszations that you want to use (near the top of your screen, not in the sidebar area). Organize them as you want them to be displayed. And finally use the minimum height values of the corresponding panels. As it is not an usual way to use the toolbar, you may have some crappy things. Use it knowing that it may create some dislaying problems. Musicmusic may fix this into the next version of UI columns.
To have tabbed panels, just use uie tabs. See here for more details. uie tabs
To get G-force without any edge or in a tab/panel, just go to your "Documents and settings/<username>/G-force" folder open the Preferences (foobar2000).txt file and change the line from "NoBo=0" to "NoBo=1". You won't be able to resize the window so, choose precisely the position and size of the window. to put it as a tab, just create a fake tab called G-Force and place precisely the window. (The window without border will take the place of the window with borders included before the change).