Hello - I'm new to this forum, and I apologize if this is an easy question -- I've searched around, but I haven't found an answer. I would like to be able to attach a line (or lines) to an editable shape. For example, I'd like to have a square, and then draw a diagonal inside the square so that each end of the line forming the diagonal attaches to the corners of the square. This is a simple example, but the idea is that if I then modify the shape of the object (say, turn it into a rhombus), the line will remain attached to the two corners. Any help will be greatly appreciated. Thank you in advance.