Password properties in SoapUI

By accident I encountered the following behaviour of SoapUI. I wanted to register a username/password combination in SoapUI.
Normally in SoapUI property values are shown as plain text.  Here I miss-typed the property for password on purpose:

But see what happens if I correctly type the word "Password":

Apparently if the property contains the word  "Password", prefixed with something indicative, it will consider the property as a password field. Cool!

By the way: the phrase "Password" should be the last in the name. For example, if you post-fix the property with "-Dev", like "ContentServerPassword-Dev", the content becomes visible again. In those case, you should phrase it like "ContentServer-Dev-Password".