Worst-case scenario: the UEd Goblin wipes the map and burns down your house.

UE3:CustomPropertyItemHandler (UT3)

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UT3 Interface >> CustomPropertyItemHandler
Package: 
Engine
Known implementing classes:
UIComp_DrawImage, UIComp_ContextMenuListPresenter, UIComp_DrawTeamColoredImage, UIComp_ListPresenter, UIComp_ListPresenterCascade, UIComp_ListPresenterTree, UIComp_UTDrawStateImage, UIComp_UTUIMenuListPresenter
This interface in other games:
UDK

Provides an interface for overriding the default behavior of routing and applying property values received from a custom editor property window item.

Classes which implement this interface would also need to specify custom property item windows

See: UnrealEd.CustomPropertyItemBindings Copyright 1998-2007 Epic Games, Inc. All Rights Reserved