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Hello,
Thank you for your post. I have been looking into it and since the XamMultiColumnComboEditor’s SelectedItems Property is read-only you are not able to bound it. This is a WPF limitation. There it is an issue submitted to the MS forums:
http://connect.microsoft.com/VisualStudio/feedback/details/540833/onewaytosource-binding-from-a-readonly-dependency-property
Also here it is explained how you can work around this:
http://stackoverflow.com/questions/1083224/pushing-read-only-gui-properties-back-into-viewmodel
Hope this helps you.
I believe this is a good solution: http://ko.infragistics.com/community/blogs/devin_rader/archive/2011/06/01/using-behaviors-to-synchronize-selected-items-of-infragistics-silverlight-controls-to-a-viewmodel.aspx
Switch the xamcomboeditor for the xammulticolumncomboeditor and you should be good to go.