Editing built in element styles.

How do I edit a Project's style set so as to change the display of all elements of a specific type?

For example:

Drop several objects of type Comment on a diagram.

Open Project->Style Set->Edit...

Click New Style

In the New Style dialog select 'For specific element', then select 'Element type' of Comment and click OK.

Now I have an entry [Comment] in the Project's Style Set Editor and editing the settings of the [Comment] style alters the style for all comments in the Project.

That's great and exactly what I want. But the thing is, how do I do that for any other element?

If I drop a 'Text' on a diagram and repeat the same process, there is no entry for 'Text' in the 'Element type' drop down when creating a new style. If I examine the properties for the 'Text' object there is nothing there which tells me what its element type is. I also notice in the 'Element type' drop down loads of entries are duplicated, e.g. Action, Message, Task, Entity etc, and they don't appear to be in any kind of order.

I notice there is a Tools->Lists->Element Names and IDs dialog. But I cannot find an entry for 'Text' under any diagram type.