c# - WPF Xaml passing Control in attribute -

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i have textbox (called searchbox) , listview (called employeelist). textbox's textchanged event displays search results in listview. works good, need functionality, want capture keyup/down events navigate through listview elements. know can add handler keyup/down events , done, using lot wanted that's reusable.

here's tried do, created static class (called searchboxhelper) , added attachable property. want pass reference listview control (not 1 of it's properties) value attachable dependency property through xaml.

/controls/searchboxhelper.cs

public static class searchboxhelper {     public static readonly dependencyproperty helpslistview = dependencyproperty.registerattached("helpslistview", typeof(listview), typeof(searchboxhelper), new propertymetadata(null, onhelpslistviewchanged));      private static void onhelpslistviewchanged(dependencyobject d, dependencypropertychangedeventargs e)     {         listview listview = d listview;          // crashes, because d not of type listview         messagebox.show(listview.name);     }      public static listview gethelpslistview(dependencyobject d)     {         return d.getvalue(helpslistview) listview;     }      public static void sethelpslistview(dependencyobject d, listview listview)     {         d.setvalue(helpslistview, listview);     }  }

/pages/employeespage.xaml

<control:navpage x:class="dtcinvoicer.pages.employeespage"              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"              xmlns:control="clr-namespace:dtcinvoicer.controls"              x:name="page" width="950" height="580"              loaded="page_loaded">      <grid margin="10">         <grid.rowdefinitions>             <rowdefinition height="40" />             <rowdefinition />         </grid.rowdefinitions>         <grid.columndefinitions>             <columndefinition width="350" />             <columndefinition width="260" />         </grid.columndefinitions>         <stackpanel grid.row="0" grid.column="0">             <textblock fontsize="22" fontweight="semibold" text="employees" />         </stackpanel>         <stackpanel grid.row="1" grid.column="0">             <control:polygoncontainer points="0,0 330,0 340,10 350,30 0,30" background="{staticresource gradient_black}">                 <wrappanel>                     <textbox x:name="searchbox" textchanged="searchbox_textchanged" control:searchboxhelper.helpslistview="{x:reference name=employeelist}" margin="5" width="300" height="20" borderthickness="0" background="#30ffffff" foreground="white" />                     <image width="18" source="/images/icons/search.png" />                 </wrappanel>             </control:polygoncontainer>             <border height="490" cornerradius="0,0,5,5" background="{staticresource gradient_blue}">                 <stackpanel>                     <control:fxlistview x:name="employeelist" itemdoubleclick="employeelist_itemdoubleclick"  height="455" borderthickness="0" background="transparent" itemcontainerstyle="{staticresource fxlistviewitemcontainer_style}" itemtemplate="{staticresource employee_listviewitem_template}" scrollviewer.horizontalscrollbarvisibility="disabled" />                     <wrappanel height="30" />                 </stackpanel>             </border>         </stackpanel>         <stackpanel margin="10,0,0,0" grid.row="1" grid.column="1">             <control:polygoncontainer points="250,0 20,0 10,10 0,30 250,30" background="{staticresource gradient_black}">                 <textblock margin="0,0,5,0" text="open employees" foreground="white" horizontalalignment="right" verticalalignment="center" />             </control:polygoncontainer>             <border height="180" cornerradius="0,0,5,5" background="{staticresource gradient_blue}">                 <control:fxlistview x:name="openemployeeslist" itemdoubleclick="openemployeeslist_itemdoubleclick" height="160" verticalalignment="top" borderthickness="0" background="transparent" itemcontainerstyle="{staticresource fxlistviewitemcontainer_style}" itemtemplate="{staticresource employeepage_listviewitem_template}" />             </border>         </stackpanel>     </grid> </control:navpage>

figured out... else might need this..

private static void onhelpslistviewchanged(dependencyobject d, dependencypropertychangedeventargs e) {     // listview listview = d listview;      // propblem line above, trying convert      // dependencyobject listview , it's textbox, should      // have been converting new value of dependencyproperty      textbox box = d textbox;     listview list = e.newvalue listview;     if(box == null || list == null) return;      box.previewkeydown += delegate(object sender, keyeventargs e2)     {         if (e2.key == key.down)             list.selectedindex += (list.selectedindex + 1 < list.items.count) ? 1 : 0;         else if (e2.key == key.up)             list.selectedindex -= (list.selectedindex - 1 >= 0) ? 1 : 0;         else if (e2.key == key.enter && list.selectedindex >= 0)         {              // enter key          }     }; }

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