Connecting extensible lines to text

I need to create a window that is the main window that act as a doc window
(container) and then windows inside, with the table names(text rows). You can see the
smaller sub windows with the table field names and then you are able to
connect the subwindows across other subwindows by using lines that are
extended, resized when the sub windows move or resize.
I guess the thing is how you attach draw lines to text and resize them ?
I would like to know if there is some model I coud use or starting point.

Any suggestions or places to look would be appreciated.