Under the hood they are secretly check boxes. The status of the checkbox indicates if the image should be popped in or popped out, or grayed out.
Selected generally refers to the cursor.
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I have been working professionally as a programmer both inside and outside the games industry since the early 1990's. I'm currently working as a tech lead in a small studio in addition to my own side projects.
When it comes to programming, I have programmed professionally for FPGA/DSP boards, PalmOS, WinCE, NDS, DSi, 3DS, PS2, PS3, XBox, X360, and of course PC, to name a few. I've also developed on unreleased hardware for several systems, including pre-release versions of some of the hardware above. I've also dabbled non-professionally in programming for lots of other systems, including various cell phones and Android.
I'm currently working as a contractor.
I'm also an author. I revised "Game Development With Unity" to the second edition. Before that I have been a contributing editor to multiple books. I've written chapters, edited entire books, developed page layouts, formatted everything in various systems ranging from MS Word to LaTeX. I've also authored several articles here on this site.
I attended graduate school at Brigham Young University, and undergraduate school at Weber State University, where I graduated cum laude with university and departmental honors.
I can play piano reasonably well, and have played organ and violin. I occasionally relax by playing some Haydn, Mozart, or Beethoven. If I'm in a really quirky mood you might hear some Chopin. For some reason I now cringe when I hear 7ths and 9ths, and I blame him and his compositions for that. Other times I will just play show tunes and my wife will sing along.
In addition to programming and games and music, I love teaching, I love small animals (I have several birds), and I love goofing off with my kids.