wpf - Why my stackpanel items always aligning to vertical if even i mentioned horizantalmode in silverlight? -


i wrote below code in page:

<stackpanel horizontalalignment="left" height="166" margin="10,602,0,0" verticalalignment="top" width="1346" x:name="thumbnailviewer">                <scrollviewer                 x:name="thumbnailviewerscroller"                 padding="0"                 borderthickness="0"                 verticalscrollbarvisibility="hidden"                 horizontalscrollbarvisibility="hidden">                     <stackpanel orientation="horizontal" >                         <itemscontrol x:name="userlist">                             <itemscontrol.itemtemplate>                                 <datatemplate>                                     <!--<stackpanel orientation="horizontal">-->                                         <image source="{binding imageurl}" tag="{binding path=id}" width="164" height="150" margin="4" stretch="fill"></image>                                     <!--</stackpanel>-->                                 </datatemplate>                             </itemscontrol.itemtemplate>                         </itemscontrol>                     </stackpanel> </scrollviewer> </stackpanel>

inside of scrollviewer mentionsed stackpanel , aligning items horizontal.but getting items alignment vertical while running of code.please tell me how align items horizontal?what wrong in code why items aliging vertical mentionsed orientation="horizontal in stackpanel.

edit:

<scrollviewer                 x:name="thumbnailviewerscroller"                 padding="0"                 borderthickness="0"                 verticalscrollbarvisibility="hidden"                 horizontalscrollbarvisibility="hidden">                     <!--<stackpanel orientation="horizontal" >-->                         <itemscontrol x:name="userlist">                             <itemscontrol.itemspanel>                                 <itemspaneltemplate>                                     <!--<datatemplate>-->                                     <stackpanel orientation="horizontal">                                         <image source="{binding imageurl}" tag="{binding path=id}" width="164" height="150" margin="4" stretch="fill"></image>                                     </stackpanel>                                 <!--</datatemplate>-->                                     </itemspaneltemplate>                                         </itemscontrol.itemspanel>                         </itemscontrol> </scrollviewer> </stackpanel>

use itemspanel of itemscontrol instead. 

<scrollviewer>    <itemscontrol ...>       <itemscontrol.itemspanel>          <itemspaneltemplate>              <stackpanel orientation="horizontal" />          </itemspaneltemplate>       </itemscontrol.itemspanel>       <itemscontrol.itemtemplate>          <datatemplate>             <image source="{binding imageurl}"                     tag="{binding path=id}" width="164" height="150"                     margin="4" stretch="fill"></image>           </datatemplate>       </itemscontrol.itemtemplate>     </itemscontrol> </scrollviewer>

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