Event which is raised when the activePane of the Spreadsheet has changed. Function takes arguments evt and ui. Use ui.owner to obtain reference to igSpreadsheet. Use ui.oldActivePane to obtain the previous active pane. Use ui.newActivePane to obtain the current active pane. Use ui.activeCell to obtain the active cell of the new active pane or null if there is no active pane. Use ui.visibleRange to obtain the current visible range of the new active pane or null if there is no active pane.
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
