MSGWrap.pty Property (Visio)
Gets or sets the pt.y member of the MSG structure being wrapped. Read/write.
expression A variable that represents a MSGWrap object.
The pty property corresponds to the pt.y member in the MSG structure defined as part of the Microsoft Windows operating system. If an event handler is handling the OnKeystrokeMessageForAddon event, Microsoft Visio passes a MSGWrap object as an argument when this event fires. A MSGWrap object is a wrapper around the Windows MSG structure.
For details, search for "MSG structure" on MSDN, the Microsoft Developer Network.