No command, but you could use a VBA subroutine/code to do this:
' ******************************************
' ** Subroutine MoveFocusToNextControl **
' ******************************************
Public Sub MoveFocusToNextControl(xfrmFormName As Form, _
xctlCurrentControl As Control)
' *** THIS SUBROUTINE MOVES THE FOCUS TO THE
' NEXT CONTROL IN THE TAB ORDER.
' First argument is the form object on which the action is to occur.
' Second argument is the control object that is the control whose tab
' order number is just before the control that is to get the focus (in
' most cases, this will be the control that currently has the focus).
Dim xctl As Control
Dim lngTab As Long, lngNewTab As Long
On Error Resume Next
' Move focus to the next control in the tab order
lngTab = xctlCurrentControl.TabIndex + 1
For Each xctl In xfrmFormName.Controls
lngNewTab = xctl.TabIndex
' An error will occur if the control does not have a TabIndex property;
' skip over those controls.
If Err.Number = 0 Then
If lngNewTab = lngTab Then
xctl.SetFocus
Exit For
End If
Else
Err.Clear
End If
Next xctl
Set xctl = Nothing
Err.Clear
End Sub