Hold changes to form properties

I am attempting to write a program that involves a bunch of different forms. I would like to be able to fill in the text of a button on another form, but as soon as I close the form the changes are are gone and the form returns to its default properties. The change I am making is something like

Dim frm As New UD_SUP
frm.SUPDU1.Text = "test"
frm.Show()
MsgBox(text)