1. Need to allow entry box updates that does not require the widget to be recreated
2. Deleting values from an extensible item does not properly work
3. Even fixed sized items should be displayed vertically
4. Labels are not properly displayed

Added ItemView Options to control aspects of the GUI:

1. ShowRecentFiles="true/false" - if the file must already exist, this option, when true, will
   display previous values using a combobox - default is false
2. ShowFileExtensions="true/false" - if the file is not required to already exist, and there are
   a set of suffixes associated with the item, this option, when true, will display the suffixes
   using a combobox - default is false
3. UseFileDirectory="true/false" - if true and if the value is set, the file browser will open in
   the directory of the current value.  If the current value's directory does not exist the browser
   will either use the DefaultDirectoryProperty value or revert to its default behavior - default
   is true
4. DefaultDirectoryProperty="nameOfResourceStringProperty" - if set and the string vector property
   value on the item's attribute resource exists and refers to an existing directory.
   the file browser will open in the directory refereed to by the property value

See fileItemExample.sbt and fileItemExample.smtk as examples.  Note that to demonstrate
DefaultDirectoryProperty using these files you will need to create a string property called
testDir and set it to something valid.

Also changed the advance level for the SetProperty Operation so it can be used in ModelBuilder