VB .NET 2003 Check Box Even Called on Load

[rex64]

I am using VB .NET 2003. The CheckedChanged even is being called when the form loads because it is the default option checked. What is a nice clean way to avoid this? Is there another event I should use? Should I disable until the end of form load? What is a good way to fix this? Thanks.

Private Sub _optFont_0_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) 
Handles _optFont_0.CheckedChanged
        theFontSize = 8.25
    End Sub