Event fired before a new merged cells group is created. Function takes arguments evt and ui. Use ui.row to get reference to the row the merged group starts in. Use ui.rowIndex to get the index of the row the merged group starts in. Use ui.rowKey to get the key of the row the merged group starts in. Use ui.owner to get reference to igGridCellMerging. Use ui.grid to get reference to the igGrid the igGridCellMerging are initialized for. Use ui.value to get the cells value which is repeated and caused the merged group to be created.
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
