Cursor keys for scrolling in listbox (PnlTreeView)

Hi everybody,
I have developed a plugin for InDesign CS2 that is based on one of the examples included with the SDK, namely the PanelTreeView example. My plugin connects to an Oracle database, interacts with a remote file storage repository, exports documents in various formats - all things that I added to the example which are working really fine, but I've as of yet been unable to add something that should be really easy. The SDK docs and existing threads here haven't revealed much that would help me, so here's what I would like to do:
If you've ever seen the PanelTreeView example, you'll know that it displays files (located in a folder) in a hierarchical tree (originally multiple levels deep, but in my own plugin only one level deep, though that doesn't matter). In order to scroll up and down in said tree, there is a scrollbar on the right of the treeView widget, just as you would expect, BUT: I'd like to be able to scroll up and down using the cursor keys. That is, when the user has selected an element in the tree and presses "Cursor Down", I want to selection focus to jump to the element below the one currently selected. And once I've reached the (visible) end of the treeView, I want it to scroll down as if the "down arrow" of the scrollbar was pressed. So all in all nothing special, only standard behaviour you have seen all over the place in zillions of apps.
The only question is: How do I achieve that? Any pointers to specific sections and / or examples in the SDK docs? I figure I need to implement some sort of keystroke handler that is only active when the user has focussed my treeView (as the cursor keys have other functions otherwise, like scrolling in the currently open document of something). Sounds easy, but where do I start?
Any hints would be very much appreciated! Big thank-you's to all of you in advance!
Greetings,
Nils

Firefox Button > Options > Accessibility tab > Check Always use the cursor keys to navigate within pages.
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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