i want use virtualizingstackpanel in treeview. when set virtualizingstackpanel.isvirtualizing true, scrolling not working properly. setting virtualizingpanel.scrollunit="pixel" doesn't work me. can smooth scrolling in virtualization mode?
<treeview name="treeview" virtualizingstackpanel.isvirtualizing="true" virtualizingstackpanel.virtualizationmode="recycling" allowdrop="true" virtualizingpanel.scrollunit="pixel"> <treeview.itemcontainerstyle> <style targettype="{x:type treeviewitem}"> <style.triggers> <trigger property="isselected" value="true"> <setter property="local:treeviewitembehavior.bringintoviewwhenselected" value="true" /> </trigger> </style.triggers> </style> </treeview.itemcontainerstyle> <treeview.resources> <datatemplate datatype="{x:type local:foldertreeviewdirectoryitem}" x:key="normalfoldertemplate" > <virtualizingstackpanel orientation="horizontal" local:pixelbasedscrollingbehavior.isenabled="true" isitemshost="false"> <image width="16" height="16" margin="4,0,0,2" snapstodevicepixels="true" renderoptions.bitmapscalingmode="nearestneighbor" style="{staticresource foldertreeviewfolderimage}"></image> <textblock text="{binding path=name,mode=twoway}" tooltip="{binding path=path}" height="20" padding="4,2,4,0" style="{staticresource foldertreeviewtextstyle}"/> </virtualizingstackpanel> </datatemplate> <datatemplate datatype="{x:type local:foldertreeviewdirectoryitem}" x:key="editfoldertemplate"> <virtualizingstackpanel orientation="horizontal" local:pixelbasedscrollingbehavior.isenabled="true" isitemshost="false"> <image width="16" height="16" margin="4,0,0,2" snapstodevicepixels="true" renderoptions.bitmapscalingmode="nearestneighbor" style="{staticresource foldertreeviewfolderimage}"></image> <textbox text="{binding path=name}" lostfocus="folderrenametextbox_onlostfocus" initialized="frameworkelement_oninitialized" keydown="folderrenametextbox_keydown" padding="4,2,4,0" style="{dynamicresource {x:static themes:sharedresourcekeys.textboxbasestylekey}}"></textbox> </virtualizingstackpanel> </datatemplate> <hierarchicaldatatemplate datatype="{x:type local:foldertreeviewdirectoryitem}" itemssource="{binding items}"> <contentcontrol content="{binding }"> <contentcontrol.style> <style targettype="{x:type contentcontrol}"> <setter property="contenttemplate" value="{staticresource normalfoldertemplate}" /> <style.triggers> <datatrigger binding="{binding folderrename}" value="true"> <setter property="contenttemplate" value="{staticresource editfoldertemplate}" /> </datatrigger> </style.triggers> </style> </contentcontrol.style> </contentcontrol> </hierarchicaldatatemplate> <datatemplate datatype="{x:type local:foldertreeviewfileitem}" x:key="normalfiletemplate" > <virtualizingstackpanel orientation="horizontal" local:pixelbasedscrollingbehavior.isenabled="true" isitemshost="false"> <image width="16" height="16" margin="4,0,0,2" snapstodevicepixels="true" renderoptions.bitmapscalingmode="nearestneighbor" style="{staticresource foldertreeviewfileimage}"></image> <textblock text="{binding path=name,mode=twoway}" tooltip="{binding path=path}" height="20" padding="4,2,4,0" style="{staticresource foldertreeviewtextstyle}"/> </virtualizingstackpanel> </datatemplate> <datatemplate datatype="{x:type local:foldertreeviewfileitem}" x:key="editfiletemplate"> <virtualizingstackpanel orientation="horizontal" local:pixelbasedscrollingbehavior.isenabled="true" isitemshost="false"> <image width="16" height="16" margin="4,0,0,2" snapstodevicepixels="true" renderoptions.bitmapscalingmode="nearestneighbor" style="{staticresource foldertreeviewfileimage}"></image> <textbox text="{binding path=name}" padding="4,2,4,0" style="{dynamicresource {x:static themes:sharedresourcekeys.textboxbasestylekey}}"></textbox> </virtualizingstackpanel> </datatemplate> <datatemplate datatype="{x:type local:foldertreeviewfileitem}"> <contentcontrol content="{binding}"> <contentcontrol.style> <style targettype="{x:type contentcontrol}"> <!-- default template --> <setter property="contenttemplate" value="{staticresource normalfiletemplate}" /> <style.triggers> <datatrigger binding="{binding filerename}" value="true"> <setter property="contenttemplate" value="{staticresource editfiletemplate}" /> </datatrigger> </style.triggers> </style> </contentcontrol.style> </contentcontrol> </datatemplate> </treeview.resources> </treeview> up 
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