binding - Multiselection combobox display text silverlight -

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i have grid, contains loads of columns. in 1 of columns have combobox, data template containing x number of checkboxes. 

<datatemplate>     <combobox itemssource="{binding data}" dropdownclosed="combobox_dropdownclosed" loaded="combobox_loaded" selectionchanged="combobox_selectionchanged">         <combobox.itemtemplate>             <datatemplate>                 <checkbox content="{binding subproject}" ischecked="{binding checked, mode=twoway}"/>             </datatemplate>         </combobox.itemtemplate>     </combobox>

what show summary of items checked in combobox when it's closed. "sub1, sub2, sub8".

however, haven't been able find way of doing this. got idea?

i found later on, , kind of answered question.

combobox display value in silverlight


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