There's a rather lengthy explanation for the underscore, but basically this is the name I used in the skin as a workaround for another issue. I've tried changing it to alpha characters with no success, as well as renaming the image files. Notice, also, the "null' behind the image on the left, which is suppose to be the product logo.
The images show in C:\...\Output\Main\Data\SkinProject as ToolbarItem_fileName.png, so I'm really stumped as to why the images don't display in the UI. Also, when I inspect the code in the browser, the code looks like this (the image size is actually 86 x 40):
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<img src="null" alt="null" style="width: 7px; height: 14px;">