I am unclear as to what you mean by "property box", however:
You aren't going to be able to set the "property box" at runtime - assuming that by "Property Box" you mean the values in the property window or dialog box that you see at design time for controls.
You can resize controls to your hearts content by handling mouse events. If you then want to save that off so the next time the user uses the application, the control will resize itself to the previous setting, then you need to store that away into some kind of persistant preferences settings. This can be in a file, in the registry, or in a database for a few ideas.
So then the question is -
Woody Z http://www.learntoprogramnow.com