Position WINDOWS TKTOPLEVEL

Hello friends!!!

I?m spanish student, I am finishing the finish project in computer science.
I am creating a R package about CircularStatistics, In october i will upload
it to CRAN. I need to resolve one problem. 
I need to put a windows created with tktoplevel into screen center.
How I could put the windows created in the center of the screen?

I have created the windows with next sentences

    tt <- tktoplevel(width="2000",height="300")

Thank you very much,
A greetings, Luismi

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