Calculating CommandBar Height

I know this was asked before by someone else but I didn't understand the answer, so let me try again:

My problem is I need to position a tabstrip right below the where ever the CommandBar ends (since the system font can affect the CommandBar height)

I would assume the solution is something like:

for i = 0 to CommandBar.Count

CommandBar(i).GetWindowRect lLeft, lTop, lRight, lBottom

lTotalHeight = lTotalHeight + (lBottom - lTop)

next i

My problem is; 1) I'm not getting any value returned in the variables I pass, and 2) Even if I did get a value would it represent Twips?  If it's not twips what is it and how do i convert it to something I can work with?

I looked through all the samples and didnt' see an example of this.  Can someone (or Oleg ) post an example?

Thanks