Setting Default & Cancel Buttons in Visual Basic.Net Form
Default button is in VB.NEt with a different name - AcceptButton. However, cancel button retains its name:
Here is a way you can set them
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
'Sets cmdOK as the button control that is clicked when the user presses the Enter key.
Me.AcceptButton = cmdOK
'Sets cmdCancel as the button control that is clicked when the user presses the ESC key.
Me.CancelButton = cmdCancel
For setting the same in VBA/VB refer : http://vbadud.blogspot.com/2007/06/setting-default-cancel-buttons-in.html