- added interface definition (INotificationMessage)
- added properties and styled properties to control (NotificationMessage)
- added builder and linq builder methods to set the type and type visibility
- added property changed handler to update the pseudoclasses of the control when the type or type visibility are changed
- removed redundant class that was added by the constructor of NotificationMessage, because there was a more elegant way of selecting the textblocks
- started work on style changes

- updated the sample to show the icons

…tifications that have the close button visibility set to true