public subs

[Narfy]

Im working on a sub to use for part of this program im working on, but ran into this problem:

In form3 I have a picture box where when the clicks on it it calls for the sub that is located in a module.

Private Sub p1_Click()
     selectplanet (p1)
End Sub

Then in the module I have this code:

Public Sub selectplanet(pbox As PictureBox)
     msgbox pbox
End Sub

but then when i run the project and click on picturebox p1, it says object required and highlights the selectplanet (p1) line, any suggestions?