c# - DependencyProperty for ItemsSource -

i have xaml like:

<usercontrol x:class="book.customcontrols.headeredcombobox"              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"              datacontext="{binding relativesource={relativesource self}}"              width="200" height="50">     <grid>         <grid.rowdefinitions>             <rowdefinition height="auto"/>             <rowdefinition/>         </grid.rowdefinitions>         <textblock grid.row="0" margin="2,2" verticalalignment="center" text="{binding header}" fontweight="{binding headerfontweight}"/>         <combobox grid.row="1" margin="2,2" verticalalignment="center" itemssource="{binding itemssource, updatesourcetrigger=propertychanged}"                   selecteditem="{binding selecteditem, mode=twoway, updatesourcetrigger=propertychanged}"/>     </grid> </usercontrol> 

the cs-file therefor is:

public partial class headeredcombobox : usercontrol {     public headeredcombobox()     {         this.initializecomponent();         this.headerfontweight = fontweights.normal;     }      public static readonly dependencyproperty headerproperty = dependencyproperty.register("header", typeof(string), typeof(headeredcombobox));     public static readonly dependencyproperty headerfontweightproperty = dependencyproperty.register("headerfontweight", typeof(fontweight), typeof(headeredcombobox));     public static readonly dependencyproperty itemssourceproperty = dependencyproperty.register("itemssource", typeof(ienumerable), typeof(headeredcombobox));     public static readonly dependencyproperty selecteditemproperty = dependencyproperty.register("selecteditem", typeof(object), typeof(headeredcombobox));      public string header     {         { return (string)getvalue(headerproperty); }         set { setvalue(headerproperty, value); }     }      public fontweight headerfontweight     {         { return (fontweight)getvalue(headerfontweightproperty); }         set { setvalue(headerfontweightproperty, value); }     }      public ienumerable itemssource     {         { return (ienumerable)getvalue(itemssourceproperty); }         set { setvalue(itemssourceproperty, value); }     }      public object selecteditem     {         { return getvalue(selecteditemproperty); }         set { setvalue(selecteditemproperty, value); }     } } 

i tried use usercontrol in window with

<customcontrols:headeredcombobox header="category" itemssource="{binding categories}"/> 

categories observablecollection<string>.

unfortunately don't see items in combobox. @ moment have no idea, i'm doing wrong. ideas?

system.windows.data error: 40 : bindingexpression path error: 'categories' property not found on 'object' ''headeredcombobox' (name='')'. bindingexpression:path=categories; dataitem='headeredcombobox' (name=''); target element 'headeredcombobox' (name=''); target property 'itemssource' (type 'ienumerable') 

your datacontext set headeredcombobox , there system looking categories. property header worked since put text without binding. possible solution

<window x:class="wpfapplication5.mainwindow"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     title="mainwindow" height="350" width="525"     xmlns:local="clr-namespace:wpfapplication5" name="window"> <grid>     <local:headeredcombobox header="category" itemssource="{binding elementname=window, path=datacontext.categories}"/> </grid>