Premiere CS4 Title: How to Create a Knockout?

this 1 driving me crazy!  can see in titler presets include word "frame" in title, there box set knock out portion of background.  life of me, can't figure out how create 1 scratch.  there appears no kind of dialog offers option.  these boxes set 0% opacity, , doesn't seem matter else going on in object - edges, formatting, color, anything.  please enlighten me!  make me feel dumb if have to.  how can create knockout box or text?

 

many thanks,

tim

this interesting. managed isolate 'box'.

i able duplicate or reshape 'box' in whatever wanted.

but not make new 1 available tools.

it's kind of garbage matte solid black background.

 

usually make text or shape in titler , color pure white.

set on timeline superimposed on video , use track matte.

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