Hi,
 I have the following sample code.It works fine when i used expander.But when i used radPane it is showing the following error.

ag_e_unknown_erro

I am posting the sample code.Please help me in this issue.

<telerik:RadExpander Grid.Column="0"  Header="Search" Grid.Row="3" Grid.RowSpan="3" ExpandDirection="Left" HorizontalAlignment="Left" IsExpanded="True">
                <telerik:RadDockPanel >
                    <telerik:RadExpander  Header="country" IsExpanded="False" ExpandDirection="Down">
                    <StackPanel Orientation="Vertical">
                        <CheckBox x:Name="cbEmergingAll" Content="All" ></CheckBox>
                        <CheckBox x:Name="cbEmergingMarkets" Content="Emerging Markets" ></CheckBox>
                        <CheckBox x:Name="cbEstablishedMarkets" Content="Established Markets" ></CheckBox>
                    </StackPanel>
                </telerik:RadExpander>
                                   
                                       
                      </telerik:RadDockPanel>
       </telerik:RadExpander>


it is working fine now.But here i used radpane.

  <dock:RadDocking Grid.Row="3" Grid.RowSpan="3" Grid.Column="0">
                <dock:RadSplitContainer InitialPosition="DockedLeft" >
                    <dock:RadPaneGroup >
                <dock:RadPane Header="Search" >
                     <telerik:RadExpander  Header="Emerging/Established" IsExpanded="False" ExpandDirection="Down">
                    <StackPanel Orientation="Vertical">
                        <CheckBox x:Name="cbEmergingAll" Content="All" ></CheckBox>
                        <CheckBox x:Name="cbEmergingMarkets" Content="Emerging Markets" ></CheckBox>
                        <CheckBox x:Name="cbEstablishedMarkets" Content="Established Markets" ></CheckBox>
                    </StackPanel>
                </telerik:RadExpander>
 </dock:RadPane>
                </dock:RadPaneGroup>
                </dock:RadSplitContainer>
            </dock:RadDocking>
Here at the closing tag of radpane it is showing the error.Please help me out of this issue

Hello suresh,

Thanks for using our controls. Unfortunately, we were not able to reproduce the described error I suggest that you try to remove and then add the references to the Telerik assemblies again. To use the RadDocking control you have to add reference to Telerik.Windwos.Controls, Telerik.Windwos.Controls.Navigation Telerik.Windows.Controls.Docking assemblies. Please let us know if you need more help.