Hi,

I'm developing a Silverlight 4 app and am using the 2010 Q1 release 1 RadGridView. I'm developing this app using the MVVM pattern and trying to keep my codebehind to a minimum.

On my View I have a RadGridView and this binds to a property on my ViewModel. I am setting a property via the SelectedItem. I have a nested RadGridView and I want to set a property on my ViewModel to the SelectedItem but I cannot. I think the DataContext of my nested grid is the element in the parent's bound collection, rather than my ViewModel. I can easily use codebehind to set my ViewModel property from the SelectionChanged event on the nested grid, but I'd rather not do this. I have tried to use my viewModelName in the ElementName in my nested grid to specify that for SelectedItem, the ViewModel is the DataContext, but I cannot get this to work. Any ideas?

Here is my Xaml:

<grid:RadGridView  
                    x:Name="master" 
                    ItemsSource="{Binding EntityClassList, Mode=TwoWay}" 
                    SelectedItem="{Binding SelectedEntityClass, Mode=TwoWay}" 
                    AutoGenerateColumns="False" 
                    > 

                <grid:RadGridView.Columns> 
                    <grid:GridViewSelectColumn></grid:GridViewSelectColumn> 
                    <grid:GridViewDataColumn DataMemberBinding="{Binding Description}" Header="Description"/. 
                </grid:RadGridView.Columns> 

                <grid:RadGridView.RowDetailsTemplate> 
                    <DataTemplate> 
                        <grid:RadGridView 
                            x:Name="child" 
                            ItemsSource="{Binding EntityDetails, Mode=TwoWay}" 
                            SelectedItem="{Binding DataContext.SelectedEntityDetail, ElementName='RequestView', Mode=TwoWay}" 
                            AutoGenerateColumns="False" 
                            > 
                                <grid:RadGridView.Columns> 
                                    <grid:GridViewSelectColumn></grid:GridViewSelectColumn> 
                                    <grid:GridViewDataColumn DataMemberBinding="{Binding ServiceItem}" Header="Service Item" /> 
                                    <grid:GridViewDataColumn DataMemberBinding="{Binding Comment}" Header="Comments" /> 
                                </grid:RadGridView.Columns> 
                        </grid:RadGridView> 
                    </DataTemplate> 
                </grid:RadGridView.RowDetailsTemplate> 

            </grid:RadGridView>