Highlight a Line drawn on Canvas

Question

I have a simple wpf app with a canvas control and a button. The button click even draws a button. What I need to do after that is when the mouse is close to the object 1/16 or 1/8th of a inch I need the line to highlight, change color, glow or something.
I can make the line change color, but my mouse cursor has to be EXACTly on it. How would I accomplish this. Secondly, what would the proper way to cature the click event on the line so that I can move/resize the line?
I am new to C# and wpf so any help is appreciated.