Does anyone have any idea how to make a rounded dotted border like in the empty TextMate project drawer?

I really have no idea where to begin.

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Review NSBezierPath for drawing any path including a rounded rectangle as well as -setLineDash:count:phase:. http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/Classes/NSBezierPath_Class/Reference/Reference.html

Review path drawing in general at http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaDrawingGuide/Paths/chapter_6_section_3.html In particular, look at the section and example for “Line Dash Style”

This sample code includes a category on NSBezierPath specifically for drawing rounded rectangles: http://developer.apple.com/samplecode/Reducer/listing21.html

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Also see HowToCreateWalkingAnts