Add tool Preferences to SDK tool

[Nebeor 0]

I made an extension tool that derives from VWExtensionTool like in the provided SDK samples.

How can i add preferences AKA object properties or parametric record to this, so that i can edit those as settings for the tool, like in this little screenshot?

I was expecting a solution similar to VWExtensionParametric for VWExtensionTool  but i didn't found a way to include the parameter definition array, 

Thanks beforehand for your advice.