[power-pro] How to give a caption to a pp bar?

[Brother Gabriel-Marie]

Hello!
I am trying to create a function similar to the bar.hideshow except that 
I need to run another command with the hide and a different command with 
the show.
My bar, which is set to autoshow as bar, is called "MATRIX"  but I can't 
figure out how to assign it a caption.

function Matrix()
    if (win.visible("MATRIX")==0)do
        bar.show("MATRIX")
        .dual...@secondworkarea()
    else
        bar.hide("MATRIX")
        ....@secondworkareamovie()
    else
        quit
    endif
    quit