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Drawers are part of the Cocoa toolbox, but starting in OS 10.4, they began to be replaced by the in-window split view "sidebar". (Mail used to show your mailboxes in a drawer, for example, but moved it inside the frame of the window at some point.)

The bits of Cocoa that support drawers includes the code that lets them exist on either side of the window and be made wider/narrower independently of the rest of the window. Apps that want to do the same thing for a sidebar need to write their own code.

This is a feature request, in other words, to make the sidebars behave more like drawers. :-)

Email the support ninjas so they know you'd like to see this added. Thanks!

Last edited by Brian; 2010-10-19 at 03:36 PM.. Reason: "write add those features" makes no sense. :-)