You probably add new properties to a class, module, window or webpage by typing the name, pressing the tab key, typing the property type, etc. But did you know that you can do all of that in the name field? Just type the entire declaration ("Status as Boolean" for example) into the field where you type the property name and the IDE will parse out the declaration and put everything in the right fields for you.
So you can type:
And then get this after you press tab: