An easy one...
From design view
select the combo box you want to set this action to.
In the Properties select the Event tab and click in the
On Got Focus line.
Click on the Build button (the 3 dot button on the right of the line)
select Code builder
The
VB code class module will open
Between these 2 lines
Private Sub Selectbase_GotFocus()
End Sub
add this code SendKeys "%{down}"
so you end up with
Private Sub Selectbase_GotFocus()
SendKeys "%{down}"
End Sub
Save your form
Now when you click or tab into the combo box the list will automatically display.
MAx