Question: How to rotate the default image for the embedded toggle button

The toggle button in the embedded components has a default image which points up and down. Is there any way to rotate this image so that it points left and right?  I though I might actually just rotate the default image gif(?) directly, but the properties window does not give the location of the gif(?) used for this image. I also can't locate the image file simply looking at the Maple program folder. Otherwise, I have to go find or create an image of my own.

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