I am having trouble with this Skateboard designer program, and I am not sure how to add items from a separate form to a list box on the main one. Any help at all would be very appreciated.

Here's my code so far:

Code:
Public Class MainForm
    Private Sub btnReset_Click(sender As Object, e As EventArgs) Handles btnReset.Click
        lblDeck.Text = String.Empty
        lblTrucks.Text = String.Empty
...