[self.mappingList scrollRowToVisible:toIdx];
[self.mappingList selectRowIndexes:[[NSIndexSet alloc] initWithIndex:toIdx]
byExtendingSelection:NO];
[self.mappingList scrollRowToVisible:toIdx];
[self.mappingList selectRowIndexes:[[NSIndexSet alloc] initWithIndex:toIdx]
byExtendingSelection:NO];