Multiple PictureBoxes Display Line Graph / Label To Follow Mouse Pointer

I am developing an application with multiple picture boxes, each displaying a line graph. I want to be able to have a label following the mousepointer showing xy coordinates of the point. I also want to allow a user to zoom in on a specific picture box by double clicking on it. The code does what I want as written (changes backcolor so I know double click event fires) except moving the position of the label to follow the mouse pointer.

However if if uncomment the line in the MouseMoved sub:
LB.Location = New Point(e.X, e.Y)
Then the label moves as desired however the double click event no longer fires.

Public Class Form1
Dim PB As New PictureBox, LB As New Label
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.Controls.Add(PB)
With PB
[Code] .....