How to get a frame's size

[John Shankland]

I have a frame called IndexCard1 with some widgets packed in it. I want to 
make several of these and put them in a grid. I need to know how many I can 
fit on the screen, so I need the size of the frame. I'm able to get the 
dimensions of the screen okay, but IndexCard1.winfo_width() seems to always 
return 1. As do all of the other size related methods I could find. So my 
question is how do I get the size in pixels of IndexCard1?

Thanks for your time.

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John