Gets or sets a value specifying whether an event was handled, if handled, default actions are not required.
true if default actions are not required; otherwise, false.
Events used to custom paint the various elements of a vertical grid fire before these elements are painted in their default manner. If the event parameter's Handled property is set to true within a handler, default painting is not performed. Otherwise, all the custom drawing performed by a user will be overridden by standard vertical grid drawing.