can i draw a straight line between two usercontrol?(with mouse)

Question

hi

i have 2 user control , i want draw a straight line between them when i select one of the usercontrols in first as startpoint and then move mouse from that to either usercontrol that use as endpoint for draw line

i have problem with that....

is it possible that when user is thinking that select which usercontrol as endpoint , the line be longer or shorter in pixels... that's means line move with mouse pointer for select the endpoint by user.

thanks in advance