How can I create an infinitely refilling draggable item in Cocoa-Applescript, Xcode?

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It's hard to explain. The only example I can give it how you can infinately drag buttons from Xcode Editor into a window, except instead of a button, I need a custom view, and instead of a window, I need a verticle list. How can I do this using AppleScript-ObjC, in Xcode?
NSTableView (or just NSScrollView) can be used, but you need to define what you are dragging - see Drag and Drop Programming Topics.
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