Another problem is an application icon in a switch-application dialog (cmd-tab). I couldn't take a screenshot, but it is a 16x16 icon. It looks ugly.
I tried to set application icons for my own application by following TheIDE as an example. At least I created a bunch of png-files, but this didn't work for me.
Finally, I set LargeIcon to 512x512 and Icon to 64x64.
Setting of a LargeIcon fixed an icon with the switch-application dialog, but in other places icon is just missing. I probably should've done something in a different way, but I couldn't figure out what exactly I need to do.