>I need to always set the focus to a textbox on the form. So after every event, command button, action, etc. I invoke a method (GoTo_Focus) which just executes the following:
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>THISFORM.txtcWorkOrderID.SetFocus()
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>My problem is that on the form I also have a non-readonly grid list which the user can click on and perfrom other functions to records; after which I must automatically set the focus to the textbox on the form (above).
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>Where is the best place the call to the GoTo_Focus() method ?

You may try grid's Valid event. Also check FAQ here how to add GotFocus/LostFocus events to the grid.