Event which is raised when the user will be prompted with a message regarding an operation that is being performed. Function takes arguments evt and ui. Use ui.owner to obtain reference to igSpreadsheet. Use ui.canCancel to obtain a boolean indicating if the operation that triggered the prompt can be cancelled. Use ui.displayMessage to obtain a boolean indicating if a message will be displayed to the end user. Use ui.exception to obtain the exception for the error, if there was one. Use ui.message to obtain or set the message that will be displayed. Use ui.trigger to obtain the action that caused the prompt to be displayed.
Target Platforms: Windows 8.1, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
