>Can any one tell me how to set the cursor back to previous text box after I click a command button which is not in tab order ?

You would need to create a form's property oLastActiveControl.

In the When event of command button you would write something like

if type('thisform.ActiveControl')='O' and not isnull(thisform.ActiveControl)
   thisform.oLastActiveControl = thisform.ActiveControl
endif

In the command button click you would put after all other code

if not isnull(thisform.oLastActiveControl)
  thisform.oLastActiveControl.SetFocus()
endif