wpf telerik user control databinding problem

[OLeksiy]

Hi I am trying to create teleric propertygrid-based user control that contains a multiline textbox, but I can't configure data-bindig.
exactly i can't call set for property

public UserControl1()
   {
       InitializeComponent();
       this.DataContext = this;
       Rad.Item = new object() { };
   }
   public string longStringVal_
   {
       get
       {
           return (string)GetValue(longStringVal);
       }
       set
       {
           SetValue(longStringVal, value);
       }
   }
public static readonly DependencyProperty longStringVal =
   DependencyProperty.Register(
       "longStringVal_",
       typeof(string),
       typeof(TextBox)
   );

<Grid>
    <telerik:RadPropertyGrid x:Name="Rad" >
        <telerik:RadPropertyGrid.PropertyDefinitions>
            <telerik:PropertyDefinition DisplayName="LongStr" OrderIndex="-1" >
                <telerik:PropertyDefinition.EditorTemplate>
                    <DataTemplate>
                        <TextBox MinLines="3" MaxLines="3"
                                 TextWrapping="Wrap"
                                 VerticalScrollBarVisibility="Visible"
                                 AcceptsReturn="true"
                                 x:Name="longStringValue"
                                 Text="{Binding Path = longStringVal_, Mode=TwoWay}"
                                 />
                    </DataTemplate>
                </telerik:PropertyDefinition.EditorTemplate>
            </telerik:PropertyDefinition>
          </telerik:RadPropertyGrid.PropertyDefinitions>
    </telerik:RadPropertyGrid>
</Grid>

Any help is much appreciated!

[Ivan Ivanov]

Hello,

The editors' DataContext is their parent PropertyGrid's Item. As the Object type does not have a longStringVal_ property your code results in a BindingExpressionPath error. The longStringVal_ is a member of the UserControl class, so that you should be using RelativeSource AncestorType binding to make it work.

Regards,
Ivan Ivanov
Telerik