Hello,
In version 9.20 it's ok, but in 10.11 rather not. I used your AlphaControls main demo from 12.06.2015. I chose Outer effects in Styles controling.
I click sBitBtn7, then I press Tab key – sBitBtn8 light up,
again Tab key – sBitBtn9 light up,
again Tab key – sBitBtn10 light up,
again Tab key – sBitBtn11 light up.
Now I click sBitBtn9, and click sBitBtn7 and then press Tab key – sBitBtn8 light up,
again Tab key – sBitBtn9 no light up,
again Tab key – sBitBtn10 light up,
again Tab key – sBitBtn11 light up.
I move mouse over sBitBtn9, and now it's light up.