The easiest will likely be to run the wizard, and take a look at the generated click bars.
Namely, the Keymaps and Broadcast modes on and off Click Bars.

If you create a new Click Bar.
You can drag it down to Click Bars, for a given character set so it will apply to that team.
You can use a custom graphic, I think it has to be .png format.
But you can use a straight color, instead of a graphic or no color/transparent along with an outline.

Edit it, in the Toolbox.
And then Export.

Open the in-game GUI and go to the click bar tab.
You can show all.
And then hide (hit the x, to close) any that you don't want.

A Click Bar will have a mapped key associated with it.
I know you want it to read: Window Current, even if the mapped key will be doing some other target.




I've not bothered with Click Bars on my setup.
But my roommate prefers to click things, rather than use shortcuts.
So I made a transparent Click Bar, for Follow.

I followed: http://isboxer.com/wiki/Click_Bars
A good and detailed post on a use of Click Bars, which might illuminate the how-to for you is here: http://isboxer.com/forum/viewtopic.php?f=21&t=2190