Block missing from dropdown list

Coding
#1

I am new to cospaces. I am trying to code with 2 balls, a ramp and a wall. The wall, ramp and first ball appear in the dropdown for some of the coding blocks such as "remove physics from “ball 1”. However, the second ball does not appear in the dropdown. Physics is turned on. What am I doing wrong?

Thanks.

Mark

#2

there is a “use in coblocks” checkbox for each item in the inspector