GridViewComboBoxColumn could not work properly in RadWindow

[Ke]

HI, I want to use GridViewComboBoxColumn in a radgridview. But I found if I use RadWindow to hold the radgridview, the combobox dropdown list could not show. However, it could work if I create my own window.
Please see my attachment code.

 public class Player
    {
        public string Name
        {
            get;
            set;
        }
 
        public Position Position
        {
        get;
        set;
        }
 
        public Player(string name, Position pos)
        {
            Name = name;
            Position = pos;
        }
    
    }

 public enum Position
    {
        [Description("China")]
        GB,
        [Description("Unite Kingdom")]
        UK,
        [Description("Unite States")]
        US
    }

public class ViewModel
    {
        private List<Player> allPlayers;
        public ObservableCollection<Player> AllPlayers
        {
            get
            {
                if (this.allPlayers == null)
                {
                    this.allPlayers = new List<Player>();
                    this.allPlayers.Add(new Player("Haibng", Position.GB));
                    this.allPlayers.Add(new Player("WHS", Position.UK));
                    this.allPlayers.Add(new Player("NY", Position.US));
 
                }
                return new ObservableCollection<Player>(this.allPlayers);
            }
        }
 
        public IEnumerable<Telerik.Windows.Data.EnumMemberViewModel> Positions
        {
            get
            {
                return Telerik.Windows.Data.EnumDataSource.FromType<Position>();
            }
        }
    }

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525"
        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        >    
    <StackPanel>    
        <Button Content="Show Combo in RadWindow" Click="Button_Click" Width="180" Height="30" Margin="10,10,10,10"/>
        <Button Content="Show Combo in Comm Window" Click="Button2_Click" Width="180" Height="30" Margin="10,10,10,10"/>
        <telerik:RadGridView x:Name="radGridView" AutoGenerateColumns="False">
            <telerik:RadGridView.Columns>
                <telerik:GridViewDataColumn Header="Name"  DataMemberBinding="{Binding Name}" TextAlignment="Left" Width="160"/>
                <telerik:GridViewComboBoxColumn  Header="Position"  DataMemberBinding="{Binding Position}" Width="*" />
            </telerik:RadGridView.Columns> 
        </telerik:RadGridView>
    </StackPanel> 
</Window>

public partial class MainWindow : Window
    {
        
        public MainWindow()
        {
            InitializeComponent();
          
 
            ViewModel vm = new ViewModel();
            this.radGridView.ItemsSource = vm.AllPlayers;
 
            GridViewComboBoxColumn combo = (GridViewComboBoxColumn)this.radGridView.Columns[1];
            combo.ItemsSource = vm.Positions;
        }
 
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            RadWin u = new RadWin();
            u.Owner = this;
            u.ShowDialog();
        }        
 
        private void Button2_Click(object sender, RoutedEventArgs e)
        {
            MyWin w = new MyWin();
            w.Owner = this;
            w.ShowInTaskbar = false;
            w.ShowDialog();
        }
    }

<telerik:RadWindow x:Class="WpfApplication1.RadWin"
             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" 
             mc:Ignorable="d" 
             xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
        <telerik:RadGridView x:Name="radGridView" AutoGenerateColumns="False">
            <telerik:RadGridView.Columns>
                
                <telerik:GridViewDataColumn Header="Name"  DataMemberBinding="{Binding Name}" TextAlignment="Left" Width="160"/>
                <telerik:GridViewComboBoxColumn  Header="Position"  DataMemberBinding="{Binding Position}" Width="*" />
            </telerik:RadGridView.Columns>
 
        </telerik:RadGridView>
        <telerik:RadToolBar>
            <telerik:RadComboBox Name="graphModes" Width="250" Height="22" Margin="3">
                <ComboBoxItem>One</ComboBoxItem>
                <ComboBoxItem>Two</ComboBoxItem>
                <ComboBoxItem>Three</ComboBoxItem>
            </telerik:RadComboBox>
        </telerik:RadToolBar>
    </Grid>
</telerik:RadWindow>

 public partial class RadWin : RadWindow
    {
        public RadWin()
        {
            InitializeComponent();
            this.Width = 400;
            this.Height = 450;
            this.WindowStartupLocation = System.Windows.WindowStartupLocation.CenterOwner;
 
            ViewModel vm = new ViewModel();
            this.radGridView.ItemsSource = vm.AllPlayers;
            
            GridViewComboBoxColumn combo = (GridViewComboBoxColumn)this.radGridView.Columns[1];
            combo.ItemsSource = vm.Positions;
        }
    }

<Window x:Class="WpfApplication1.MyWin"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"        
        Title="MyWin" Height="300" Width="300">
    <Grid>
        <telerik:RadGridView x:Name="radGridView" AutoGenerateColumns="False">
            <telerik:RadGridView.Columns>
 
                <telerik:GridViewDataColumn Header="Name"  DataMemberBinding="{Binding Name}" TextAlignment="Left" Width="160"/>
                <telerik:GridViewComboBoxColumn  Header="Position"  DataMemberBinding="{Binding Position}" Width="*" />
            </telerik:RadGridView.Columns>
 
        </telerik:RadGridView>
    </Grid>
</Window>

 public partial class MyWin : Window
    {
        public MyWin()
        {
            InitializeComponent();
            this.WindowStartupLocation = System.Windows.WindowStartupLocation.CenterOwner;
 
            ViewModel vm = new ViewModel();
            this.radGridView.ItemsSource = vm.AllPlayers;
 
            GridViewComboBoxColumn combo = (GridViewComboBoxColumn)this.radGridView.Columns[1];
            combo.ItemsSource = vm.Positions;
        }
    }

<Application x:Class="WpfApplication1.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
         
    </Application.Resources>
</Application>

    public partial class App : Application
    {
    }

[Miroslav Nedyalkov]

Hello Ke,

We are aware of this problem and it should be fixed in the latest internal build. The fix also should be included in the upcoming beta version.

Best wishes,
Miroslav Nedyalkov
the Telerik team