Drawing selectable connections

[jamie]

at intersections that involve thats, you can first test where the  mouse is closes too and select that one.
or  in such cases, you can have a floating list box that will pop up at that intersection with the list of
possible items to select .
   Using a TlistBox that is not visible except when you need is a good idea.  You can set the position of the
box to appear where your mouse cursor is in cases of multiple hits. Populate the list first with the possible hits.

 each object should have a hit test function, you enumerate through them each time you click and build a list of them

 when you reach the last one in the list, you test for more then one, if so, show the list box, otherwise, pick the
only there.