PlugIn ToolBar Icon Not Dsiplaying Correctly

Question

I have created an Acrobat DC PlugIn which creates a toolbar. The icon for the toolbar initially shows up correctly, but on subsequent mouse clicks of the icon, it turns black. I cannot find any significant documentation on the AVToolBarSetIcon function and am going by one or two samples I have seen. I am not sure what the two images in AVToolBarSetIcon should be. It doesn't seem to matter what the second one is though. The code is shown here:

ASPathName pn = ASFileSysCreatePathFromCString( ASGetDefaultFileSys(), settings.logoFilename );
PDDoc doc = PDDocOpen( pn, ASGetDefaultFileSys(), NULL, false );
AVIcon icon1 = AVIconCreateFromPDF( doc, 0, 24, 24 );
AVIcon icon2 = AVIconCreateFromPDF( doc, 1, 24, 24 );
AVToolBarSetIcon( mainToolbar, icon1, icon2 );
PDDocClose( doc );

Before Clicking:

After Clicking:

Test Screen Name · Answer

This is poorly documented or poorly implemented, I am not sure which. Do you do anything with the PDF icon file after closing it? My experience is that Acrobat takes a lock to prevent the close, and continues to try to read it after you close it.

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