Drag-and-drop tree list from files/folder

Hello all. I'm new to Flex and I'm looking for some help or
for someone to point me in the right direction. I want to write a
simple AIR application to accept a multiple text files (or a folder
full of text files) when the files/folder is dragged into a tree
list. The file/folder name will be the node name. When selected,
the contents of the file will be displayed in a text area. The text
file will contain a 4 x 4 number matrix with each column separated
by a tab and each row separated by a return. (I plan on plotting
the numbers in the matrix in the future).
What I'm most confused about is how to go about
dragging-and-dropping files into a tree list and creating item
names based on the file/folder name? And does the file content need
to go into an array collection?
Maybe I'm going about this in a difficult way. If there is an
easier way, I'd appreciate it if someone could share. Thank you
all.

I have the same problema and I´m not able to find the reason.
The solution to get the event raised has been to copy configurations from wd standard appl FPM_TEST_DND_FORM and use my own Z feeder class : all seems to work perfectly , but , if I try to do it from scratch the event FPM_DROP_COMPLETED it´s not raised .
I´ve compared both configurations/class ( the one that I´ve done from scratch that it doesn´t raise the event and the one that I´ve adapted copying from standard that it raises perfectly the event) and I haven´t seen any difference (maybe I haven´t found) .

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Hello!
I found this wonderful example of a drag and drop tree, with the ability to save the changes, but I'm not quite sure how to go about implementing it. Can someone point me in the right direction?
Thank you,
Tammy

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Regarding your question on how to get started:
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#import "AppDelegate.h"
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Drag-and-drop tree list from files/folder

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