I would recommend you put the context specific content into a MultiPage tab control. Then you can show/hide the tabs to enable/disable chunks. This tends to work more simply than varying the tops/heights of things. It also provides a bit of safety since text boxes out of sight are still part of the tab order (unless also disabled) so the user might tab into one without seeing it on the form.
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Andrew Lockton
Chrysalis Design, Melbourne Australia
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