windows phone 7 - How to use multitouch behaviour from multitouch.codeplex.com -


i want pinch zoom in images in windows phone 7.1 app. here steps have followed -

downloaded latest binaries.
added system.windows.interactivity.dll , multitouch.behaviors.silverlight.wp71.dll project wp71/release folder.
added reference in xaml: 

xmlns:mt="clr-namespace:multitouch.behaviors.silverlight4;assembly=multitouch.behaviors.silverlight.wp71" xmlns:i="clr-namespace:system.windows.interactivity;assembly=system.windows.interactivity"

here code: 

<image source="pic.jpg">             <i:interaction.behaviors>                 <mt:multitouchbehavior istranslateenabled="true"                                        isrotateenabled="false" />             </i:interaction.behaviors>         </image>

i'm getting error on running app:

the type 'multitouchbehavior' not found.


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