silverlight - ComboBox's SelectionChanged inside datagrid not firing mvvm -


i using mvvmlight toolkit event interactions, have tried many solutions available none worked. combo box inside data grid's selection changed event not firing here xaml:

i used both invokecommandaction , eventtocommand:

eventtocommand command="{binding rlccbselectionchanged, mode=oneway}"                                                         passeventargstocommand="true"  invokecommandaction command="{binding rlccbselectionchanged, mode=oneway}"

please tell me missing?? selection changed event fires on data grid same procedure given above.

well answer quite simple missing attribute optional why leave 1 causes selection change event not fire. add view model key static resource , worked :)

so working xaml :

<i:eventtrigger eventname="selectionchanged">                                      <i1:invokecommandaction command="{binding  path=rlccbselectionchanged, source={staticresource dvm}}"/>                                  </i:eventtrigger>

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