Question on classes that inherit controls

Why is it that you must debug VS in order to "update" a class that inherits a control? For example:

1. I create a class that inherits a panel
2. I add a few custom properties

before the control is listed in the toolbox, you must debug. Then, if I were to set the borderstyle of that class based on a custom boolean property, I would have to debug again in order for the method that I use to change the borderstyle to take effect. So I guess my question would be, why do we have to debug first for any changes to update and is there anyway to bypass that?