c# - WPF Custom Component Datagrid binding -

so, trying perform databinding custom component have, can't seem find information on how so. have custom component in main window have bindning property...

<local:multicolumncombobox itemssource="{binding customers}" x:name="newcombo"></local:multicolumncombobox> 

and in custom component...

<datagrid itemssource="{binding itemssource}" name="datagrid"></datagrid> 

if knows how this, guidance appreciated :)

edit

 public static readonly dependencyproperty itemssourceproperty = dependencyproperty.register("itemssource", typeof(ilist<customer>), typeof(multicolumncombobox)); public multicolumncombobox() {     initializecomponent(); } //items source binding public ilist<customer> itemssource {          {          return (ilist<customer>)getvalue(itemssourceproperty);      }     set      {         system.console.writeline("binding");         system.console.writeline(value);         setvalue(itemssourceproperty, value);     } } 

i've gotten binding error seeing when pass wrong ownertype dependencyproperty.register method... please check make sure you're using typeof(multicolumncombobox) shown below.

/// <summary> /// interaction logic multicolumncombobox.xaml /// </summary> public partial class multicolumncombobox : usercontrol {     /// <summary>     /// creates dependency property collection display.     /// </summary>     public static readonly dependencyproperty itemssourceproperty =         dependencyproperty.register("itemssource", typeof(ilist<customer>), typeof(multicolumncombobox));      /// <summary>     /// property gets collection that's being displayed.     /// </summary>     public ilist<customer> itemssource     {         { return (ilist<customer>)getvalue(itemssourceproperty); }         set { setvalue(itemssourceproperty, value); }     }      public multicolumncombobox()     {         initializecomponent();     } } 

also, make sure set binding elementname in usercontrol has right datacontext.

<usercontrol x:class="dependencypropertyexample.multicolumncombobox"              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"              x:name="usercontrol1">     <grid>         <datagrid itemssource="{binding path=itemssource, elementname=usercontrol1}" />     </grid> </usercontrol>