Gets or sets a value indicating whether CloseUpEventArgs.Value should be accepted or discarded.
true, if the value must be accepted; otherwise, false.
Initially, the AcceptValue property specifies whether the user has accepted or discarded the selected value. The value itself is passed as the CloseUpEventArgs.Value property.
You can change the AcceptValue property depending on your needs and thus override the user's choice.
If the AcceptValue property is set to false, the editor will still display the newly selected value until the editor loses focus.
Refer to the RepositoryItemPopupBase.CloseUp event for more information.