The Property Tool works similarly to other metamodeling tools. For example, to view specifications of a property type, press the Open toolbar button and then select the property type you want to view from the dialog. You can also open a Property Tool on a specific type by double-clicking that type in another metamodeling tool or the Types Browser.

Property types have limited modification possibilities. Their type name can be changed afterwards, and list members can be added and removed from lists, but otherwise the property types cannot be changed much.

For example, modifying the data type could lead to some instances of the property being strings, and others being collections of objects. Similarly, changing the data type or widget will invalidate any existing custom property dialogs for non-property types that use this property. Default property dialogs will adjust automatically, but you must change others yourself: see Section 3.

However, it is possible to change the data type of the property if there are no instances of that property type, and no non-property types using it with custom property dialogs. Whilst MetaEdit+ will check and warn you if there are any such instances or types loaded, it cannot check instances or types in unopened projects, or instances that have not yet been loaded. You are therefore responsible for knowing whether such instances or types exist.