You have to key off the constant properties.
Usually it's the window ID and Caption. If nothing is constant I am not sure what you are testing. Something has to be constant. It even helps if there is something else associated to this control that you can access. You may want to tab over to your control or something.
sounds like your developers are using dynamic id's. tell them you need the id's to be static. Or if only 1 or 2 numbers in the id changes, you can use the '*' wildcard in your tag. Or use the caption as the id.