I am developing an app in Cocoa. I need to show a progress at the bottom bar of window. But I am searching for a solution to put a bottom bar in a NSWindow
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Well technically the answer of Tom is ok. You can find some comments on this how to handle this in IB.
In general you should take a look into the OS X Human Interface Guidelines. It recommend not to use bottom bars for new apps.
This is the code to put a bar at the bottom of the window (like in the finder):
[theWindow setContentBorderThickness:24.0 forEdge:NSMinYEdge];
Tom's answer is correct, but also take a look at BWToolKit. It includes a few nice controls for working with bottom bars.