Does anyone have an example of binding a ComboBox to a Selected Item of a DataGrid? I have tried a bunch of ways, but I can't seem to get it to work. I am fairly new to MVVM so I am doing something wrong. Any help would be appreciated. I have the datacontext of the grid that the combobox is in set to the datagrid, but when I select a row from the datagrid the combobox does not change. All of the text boxes are populated with the data from the datagrid, but the combobox does not change. The combobox in question is cmbRoles.

Thank you,

RG

Here is the XAML:

```
<UserControl x:Class="Compliance.Views.UserAdministrationView"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
         xmlns:local="clr-namespace:Compliance"
         xmlns:views="clr-namespace:Compliance.Views"
         xmlns:helpers="clr-namespace:Compliance.Helpers"
         xmlns:vm="clr-namespace:Compliance.ViewModels"
         xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
         mc:Ignorable="d" 
         d:DesignHeight="1000" d:DesignWidth="800">
<UserControl.Resources>
    <helpers:ActiveStatusConverter x:Key="ActiveStatusConverter"/>
</UserControl.Resources>
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="Auto" />
        <RowDefinition Height="Auto" />
    </Grid.RowDefinitions>
    <StackPanel Orientation="Vertical" HorizontalAlignment="Center" VerticalAlignment="Center" Grid.Row="0" Margin="15">
        <Label Content="User" Height="25" FontSize="14" HorizontalContentAlignment="Center" />
        <Grid HorizontalAlignment="Center" VerticalAlignment="Top" DataContext="{Binding ElementName=usersDG, Path=SelectedItem}">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="Auto" />
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" MinHeight="35" />
            </Grid.RowDefinitions>
            <telerik:Label Content="User Name: " Grid.Column="0" Grid.Row="0" HorizontalAlignment="Right" VerticalAlignment="Center" />
            <TextBox Grid.Column="1" Grid.Row="0" MinHeight="23" HorizontalAlignment="Left" VerticalAlignment="Center" MinWidth="180" MaxWidth="180" >
                <TextBox.Text>
                    <Binding Path="UserName" Mode="TwoWay" ValidatesOnDataErrors="True" NotifyOnValidationError="True"/>
                </TextBox.Text>                    
            </TextBox> 
            <telerik:Label Content="First Name: " Grid.Column="2" Grid.Row="0" HorizontalAlignment="Right" VerticalAlignment="Center" />
            <TextBox Grid.Column="3" Grid.Row="0" MinHeight="23" HorizontalAlignment="Left" VerticalAlignment="Center" MinWidth="180" MaxWidth="180">
            <TextBox.Text>
                <Binding Path="FirstName" Mode="TwoWay" ValidatesOnDataErrors="True" NotifyOnValidationError="True"/>
            </TextBox.Text>
            </TextBox>
            <telerik:Label Content="Last Name: " Grid.Column="4" Grid.Row="0" HorizontalAlignment="Right" VerticalAlignment="Center" />
            <TextBox Grid.Column="5" Grid.Row="0" MinHeight="23" HorizontalAlignment="Left" VerticalAlignment="Center" MinWidth="180" MaxWidth="180">
            <TextBox.Text>
                <Binding Path="LastName" Mode="TwoWay" ValidatesOnDataErrors="True" NotifyOnValidationError="True"/>
            </TextBox.Text>
            </TextBox>
            <telerik:Label Content="Email: " Grid.Column="0" Grid.Row="1" HorizontalAlignment="Right" VerticalAlignment="Center" />
            <TextBox Grid.Column="1" Grid.Row="1" MinHeight="23" HorizontalAlignment="Left" VerticalAlignment="Center" MinWidth="180" MaxWidth="180">
                <TextBox.Text>
                    <Binding Path="Email" Mode="TwoWay" ValidatesOnDataErrors="True" NotifyOnValidationError="True"/>
                </TextBox.Text>
            </TextBox>
            <telerik:Label Content="Active Status: " Grid.Column="2" Grid.Row="1" HorizontalAlignment="Right" VerticalAlignment="Center" />
            <telerik:RadComboBox x:Name="comBoxActiveStatus" Grid.Column="3" Grid.Row="1" MinHeight="23" MinWidth="180" HorizontalAlignment="Left" VerticalAlignment="Center"
                    SelectedItem="{Binding Path=ActiveStatus, 
                                    Converter={StaticResource ResourceKey=ActiveStatusConverter}, 
                                    Mode=TwoWay, 
                                    ValidatesOnExceptions=True, 
                                    NotifyOnValidationError=True}">
            </telerik:RadComboBox>
            <telerik:Label Content="Role: " Grid.Column="4" Grid.Row="1" HorizontalAlignment="Right" VerticalAlignment="Center" />
            <telerik:RadComboBox x:Name="cmbRoles" DisplayMemberPath="RoleName" 
                        Grid.Column="5" 
                        Grid.ColumnSpan="3"
                        Grid.Row="1" 
                        MinHeight="23" 
                        HorizontalAlignment="Left" 
                        ItemsSource="{Binding}" 
                        Margin="5" 
                        VerticalAlignment="Center" 
                        MinWidth="180" 
                        SelectedItem="{Binding RoleName}"
                        IsSynchronizedWithCurrentItem="True">
            </telerik:RadComboBox>
            <Button Grid.Column="0" Grid.Row="2" Grid.ColumnSpan="3" Content="Save User" Width="100"  />
            <Button Grid.Column="4" Grid.Row="2" Grid.ColumnSpan="3" Content="Add User"  Width="100"  />
        </Grid>
    </StackPanel>
    <Border CornerRadius="10" BorderThickness="5" Grid.Row="1" VerticalAlignment="Top" HorizontalAlignment="Center">
        <Grid HorizontalAlignment="Center" VerticalAlignment="Center">
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
            </Grid.RowDefinitions>
            <Label Content="Users" Grid.Row="0" Height="25" FontSize="14" HorizontalContentAlignment="Center" />
            <telerik:RadGridView x:Name="usersDG" ItemsSource="{Binding Users}" AutoGenerateColumns="False" ShowGroupPanel="False" IsReadOnly="True">
                <telerik:RadGridView.Columns>
                    <telerik:GridViewDataColumn DataMemberBinding="{Binding UserName}" Header="User Name" />
                    <telerik:GridViewDataColumn DataMemberBinding="{Binding FirstName}" Header="First Name" />
                    <telerik:GridViewDataColumn DataMemberBinding="{Binding LastName}" Header="Last Name" />
                    <telerik:GridViewDataColumn DataMemberBinding="{Binding Email}" Header="Email" />
                    <telerik:GridViewDataColumn DataMemberBinding="{Binding Role.RoleName}" Header="Role Name" />
                    <telerik:GridViewDataColumn DataMemberBinding="{Binding ActiveStatus, Converter={StaticResource ActiveStatusConverter}}" Header="Active Status" />
                </telerik:RadGridView.Columns>
            </telerik:RadGridView>
        </Grid>
    </Border>
</Grid>

```