How to increase the window edge/corner grabber size?

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M\joe@actionline.com
|MSteve Litt
MBrian Cluff
M\joe@actionline.com
|M-\Michael Butash
|M\|sean
||M|Steve Litt
||M|Michael Butash
||.MBrian Cluff
M|Brian Cluff
|MBrian Cluff
MMichael Butash