Which is the block that defines any item in the list to be added to another list?

[RamNaresh]

Sorry, but didn't get the message. Maybe this is helpful to you.

Any component Button

To @ABG's point, you iterate over the global buttons list in your procedure, but then you pass global buttons to the set Button.Text of component to block when you probably mean to pass item since it represents an individual button from the list.