The following example sets the HyperlinkAddress property of a command button and then opens the hyperlink when the form is loaded.
To try this example, create a form and add a command button named Command0. Paste the following code into the form's module and switch to Form view:
Private Sub Form_Load()
Dim ctl As CommandButton
Set ctl = Me!Command0
With ctl
.Visible = False
.HyperlinkAddress = "http://www.microsoft.com/"
.Hyperlink.Follow
End With
End Sub