How do I get picture control to display PNG images with transparent background?

I have an image of a robot arm looking from the top with a transparent background and saved as PNG. When I drag the image directly to LabVIEW front panel, the image shows properly with the transparent background, but I want to manipulate it such as rotate the image. I used the Read from PNG.vi to read the image to a picture control, but the background isn't transparent anymore. Am I missing something?
Please help.

unclebump gets 5 stars for referring you to a document that I wrote.
Incidentally, I wrote it years back, for LabVIEW 7.0. A couple of notes to summarize:
The picture control doesn't "really" support transparency. However, the image data type supports masking, and stores the alpha channel, if present in your image data. So you use the "Create Mask By Alpha.vi" referenced in that document to mask out pixels whose transparency is above a certain level. It does not support partial transparency. You could try to implement your own blending algorithm based on the picture control's current pixel values, and the image data's RGB value and transparency value, but it would probably be very slow.
Also, that VI ships with 8.0 and later. I don't know if it's on the palettes but it lives here: vi.lib\picture\picture.llb\Create Mask By Alpha.vi
Good luck!

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