I've been using Visio 2007 SP2 since early 2008 for generating MEP P&ID's.  But, recently I've been taking C/C++ Programming courses at UCSD.  This semester we are learning OOP and UML Diagrams.  The 1st lesson required us to create a UML class diagram with 3 private objects, 5 public functions and a <<constructor>> function.  

However, the Visio help (off/on-line) does not explain how to create this constructor function that initializes the 3 private
objects when the instance is created.  I created a function in the operation properties for a constructor - Data(month: Integer, day: Integer, year: Integer).  But, I don't know how to make this a Visio 2007 UML constructor identified by <<constructor>> in front of Date(...).

According to what I could find on-line, I created a new stereotype(UML --> stereotype) "constructor" with Base Class = "Class" and
IsRoot, IsLeaf and IsAbstract unchecked.  I then Right+Clicked on
the Date Class block, clicked on Operations, selected the
constructor "Date", clicked on Properties --> UML Operation
Properties for Date.  Can you tell me why Visio will not let me set the stereotype for Date to constructor?  What am I missing here?