>> While I’m at it, what is the IF TYPE( “toControl.BackColor”) = “C” protecting us from? That is, how could our control not exist if we are passing only controls found in our form with FOR EACH oControl in THIS.Controls

Noy all controls have BackColor properties, and I imagine that any "crawler" that iterates through object collections must check first... By the way, don't forget that the crawler must not only traverse the form, but also recursively any containers therein...