This example creates a command bar named "Custom" and adds a ComboBox control and a Button control to it. The example then uses the SetFocus method to set the focus to the ComboBox control.
Set focusBar = CommandBars.Add(Name:="Custom")
With CommandBars("Custom")
.Visible = True
.Position = msoBarTop
End With
Set testComboBox = CommandBars("Custom").Controls _
.Add(Type:=msoControlComboBox, ID:=1)
With testComboBox
.AddItem "First Item", 1
.AddItem "Second Item", 2
End With
Set testButton = CommandBars("Custom").Controls _
.Add(Type:=msoControlButton)
testButton.FaceId = 17
' Set the focus to the combo box.
testComboBox.SetFocus