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The NSTableView.EditColumn binding asserts that theEvent argument must not be null. This is incorrect. When programmatically initiating a cell edit on NSTableView or its subclasses, use of nil for the argument is correct.
You can work around this as follows.
NOTE: This workaround assumes you wish to select the contents of the cell.
NOTE: This workaround assumes the NSTableView is a direct binding.
internal static class NSTableViewHelpers
static IntPtr selEditColumnRowWithEventSelect_Handle = MonoMac.ObjCRuntime.Selector.GetHandle("editColumn:row:withEvent:select:");
internal static void EditColumn(this NSTableView table, int column, int row)
MonoMac.ObjCRuntime.Messaging.void_objc_msgSend_int_int_IntPtr_bool (table.Handle, selEditColumnRowWithEventSelect_Handle, column, row, IntPtr.Zero, true);
Fixed in master \ 0d7ff85c94b52294a7cede349cca7d2f36956d27