Dynamic Block problem.

I've downloaded a Dynamic Weld block from a forum. I want to add a Flip parameter. It seems to add ok in Editor but when I go to "Test Block window" it doesn't show up. I've been able to edit all other parts of block (move lines around,etc.) but can't seem to add a new parameter/action. I will attach the block for your perusal.

Thanks for anything anyone can do to help me out here.