WebDropDown with Multiselect into WebDataGrid


      We are trying to use a webdropwn into a grid with multiselection option enabled, because have  a relation many to many. It mean, have a specific Datasource for webdropdown and other for the grid, but exist a relation between the tables.  Currently we are using DropDownProvider with an Editor control, that works perfect when is a simple relation, but no when is a relation many to many. Found out in the release notes (https://www.infragistics.com/help/aspnet/known-issues-and-limitations-aspnet-17-1) that Drop-down editor provider of WebDataGrid does not support multiselection, Is there any solution for the issue ? Could you provide an example to solve the issue ?