A dynamic variable. Have a look at WADynamicVariable its subclasses and their users to understand how they are supposed to work. Because an user might load other packages into the image that define new subclasses of SW2Structure that should appear in the add dialog. Therefor the list of possible types needs to be determined at runtime without the need to flush the cached descriptions. Indeed, this should become a page editor for users not knowing about the wiki syntax. It is very unfinished for now, but give it a try and you will see. Lukas -- Lukas Renggli http://www.lukas-renggli.ch