Manages the options that are displayed to the user in the instance selection drop-down.
 public AbstractTypePropertyEditor(Type baseType)
 {
     _options = new TypeDropdownOptionsManager(baseType, /*allowUncreatableTypes:*/ false);
 }
 public AbstractTypePropertyEditor(Type baseType)
 {
     _options = new TypeDropdownOptionsManager(baseType, /*allowUncreatableTypes:*/ false);
 }