You can get TextEdit's source code and see how they did it: 
https://developer.apple.com/library/mac/samplecode/textedit/Introduction/Intro.html
________________________________________
From: cocoa-dev-bounces+lrucker=vmware....@lists.apple.com 
[cocoa-dev-bounces+lrucker=vmware....@lists.apple.com] on behalf of Ulf Dunkel 
[dun...@calamus.net]
Sent: Thursday, October 16, 2014 5:13 AM
To: Cocoa Development
Subject: NSTableView inside NSTextView

When I place a table (NSTableView) in an TextEdit document, I can easily
resize the column width of any table column using the mouse pointer,
just by dragging the column border lines to and fro.

In my app, I want to use the same tables (NSTableView), but inside
NSTextView containers in a layout document. Is it possible to get
information about whether the mouse pointer is over the column border
lines of a nested NSTableView inside an NSTextView? At the moment, the
text edit mode for my NSTextView handles clicks into the table cells of
the embedded NSTableView so I can type in some text there. But I cannot
drag the column border lines for resizing columns widths and/or row heights.

Is this not possible?

---Ulf Dunkel
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