The propertychanged event doesn't seem to work for most of the properties in the Column class.I would expect that the following  code would fire property changed events on VisiblePosition, ReadOnly and IsMainColumn. However the example only fires property changed events for IsMainColumn.

Column c = new Column();
c.PropertyChanged += new System.ComponentModel.PropertyChangedEventHandler( OnColumnPropertyChanged );
c.VisiblePosition = 1;
c.VisiblePosition = 5;
c.ReadOnly = true;
c.ReadOnly = false;
c.IsMainColumn = true;
c.IsMainColumn = false;

IsMainColumn is a CLR property and therefore its change notification goes through the PropertyChanged event.

ReadOnly and VisiblePosition are dependency properties for which you need to use the dp change notification system: DependencyPropertyDescriptor.AddValueChanged Method