mvvm - RelayCommand and popup in Windows Phone -


i'm writing app windows phone 8.0 , have problem relaycommand mvvm toolkit light , popup.

i have longlistselector on popup:

<popup x:name="popup" grid.row="0" grid.rowspan="3" opened="popupopened">     <grid>         <scrollviewer grid.row="2" margin="10">             <phone:longlistselector itemssource="{binding itemsselections}"                                     itemtemplate="{staticresource detailsitemtemplate}" />         </scrollviewer>     </grid> </popup>

and item's template:

<datatemplate x:key="detailsitemtemplate">     <button verticalcontentalignment="stretch" horizontalcontentalignment="stretch" margin="5,5,5,5"         command="{binding elementname=layoutroot,path=datacontext.itemexecutioncommand}"         commandparameter="{binding type}">     </button> </datatemplate>

when open popup first time, works fine, canexecute returns false, buttons disabled , disable style applied (foreground gray). but, when close popup , open again, buttons disabled, have normal style (foreground white). executing raisecanexecutechanged method after every popup opening not help. has problem?


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