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You would use the Button argument of the MouseDown or MouseUp event for the control. See if this helps -- start a project and put a PictureBox control on it and use this code in its MouseDown event:

Private Sub Picture1_MouseDown(Button As Integer, Shift As Integer, X As
Single, Y As Single)
      If Button = 1 Then
         Debug.Print "LEFT"
      ElseIf Button = 2 Then
         Debug.Print "RIGHT"
      End If
End Sub

If Button equals one, then the Left mouse button was pressed; if Button equals two, then the Right button was pressed; and if Button equals four, then a middle button (if present) was pressed.