By default, the DisplayFile  property is False. Use the DisplayFile property to let a property display and edit a string expression that represents the path to a file. For instance, let's say that your object lists a property of string type that changes the path to a file, so you can assign the open file editor to change the listed path. The PropertyChange event notifies your application that user is about to change a property. The control fires the PropertyChanged event when the user changes any property in the control. The DisplayCheck, DisplayColor, DisplaySlider or DisplayDate property specifies whether the property displays a checkbox, color, slider, or date.