Setting backgroundColor to transparent

Hi All,
I'm using the tree component, and wondered if there was a way
to set the backgroundColor style to "none".
I saw one user used this.tree.setStyle("_alpha","0"); This
had some success, but it also removed all color for my depthColors.
Basically, is there a way to remove background color for the whole
component and still have depthColors?
Thanks
Dave
However I also want to have

Chris, first off thank you so much for your patience. I really appreciate it.
I opened your sample file and it works perfectly. But when I create something similar myself it simply doesn't work. I created a brand new file, inserted an image, and inserted a textbox on top of it. I gave the textbox a white fill, and I copied and pasted your code into the text field's Exit event. And it just doesn't work.
What's more, I tried copying and pasting your textbox and image into a file of mine, and yours didn't work in my file.
I have uploaded my sample. I don't know how to attach files to these messages, so you can find it at:
If you could just take a quick look at it and let me know what I am doing wrong that would be great. I'm sure it's something minor.
Oh, and for the record, I am using Adobe LiveCycle Designer Version 7, 0, 041126, 0 Cipher: 128-bit, in case that has something to do with it.
This is driving me up a wall. I thought this would take 2 minutes to do and I have literally spent hours trying to make it work.

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