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Indeed there is a checkbox for Maintain aspect ration when you scale by value. But I haven't found how to scale proportionally with size grips...

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up vote 3 down vote accepted

Try holding shift while resizing, normally works for most apps.

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I tried most of the keys by now.. no good –  Pablo Jun 18 '10 at 13:18
    
You looked through the manual too? –  Christoffer Madsen Jun 18 '10 at 13:18
    
Manual doesn't say much about scaling by mouse, only by value. –  Pablo Jun 18 '10 at 13:22
    
It seems like the official manual says that it is shift. "Resize and keep aspect ratio ----- Select, then (shift sign)-drag a resize handle!-" omnigroup.com/ftp/pub/software/macosx/Manuals/… Page 97 –  Christoffer Madsen Jun 18 '10 at 13:23
    
Yes! the shift key works on Omnigraffle. Thanks, it a life saver. –  Phani Aug 29 '13 at 6:11
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Alternatively export to PDF, then import from PDF and resize.

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