问题
sry i couldn't draw any better with paint. what i am trying to do here is create a tree structure (like the one in the picture) using TFrames. and basically when i press the + buttons, a new TFrame would be added to the tree. I am using C++ Builder, and I know how to do the adding of the TFrame, my problem is i don't know how to draw the green lines of the tree.
thanks in advanced.
来源：https://stackoverflow.com/questions/9212994/tree-structure-with-tframes