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GridViewComboBoxColumn strange trouble

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This is a migrated thread and some comments may be shown as answers.
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Peter asked on 04 Jul 2012, 02:46 PM
Hi, we have very strange GridViewComboBoxColumn's behaviour. Code is very simple, but we have different result when execute our program on different PC. Normal behaviour should be next:
1) select any item in 3rd row combobox;
2) choose second cell in this row.
3) selected item in 1st column should be selected!!!

But on 50% PC we don't have this, i.e. selected item pull down everywhere. We lose selected item on LostFocus. In debug mode we saw, that debugger comes to GET of Employee.Name property after ComboBox selection changed (on the PC with wrong behaviour). And debugger comes to SET of this property on the PC with normal behaviour. It's hard to believe and to explain. What's wrong with this control?

BUT !!! We don't have any trouble if use common template with ComboBox (i.e. without using GridViewComboBoxColumn) - ex.code3.

Ex.code1: Main Window XAML:
<telerik:RadGridView Name="dGrid" AutoGenerateColumns="False" Height="188" VerticalAlignment="Top">
            ItemsSourceBinding ="{Binding Path=Names, Mode=TwoWay}"
            DataMemberBinding="{Binding Path=Name, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
            DataMemberBinding="{Binding Path=Name, Mode=TwoWay}">

Ex.code2: Main window C#:
public MainWindow()
    _employees = new List<Employee>(){
                 new Employee {Names = new List<string>{"Ann", "Nata"}, Name = "Ann"},
                 new Employee {Names = new List<string>{"Elise", "Ivan", "Марк"}, Name = "Ivan"},
                 new Employee {Names = new List<string>{"Elise", "Ivan", "Марк"}},
    dGrid.ItemsSource = _employees;

Ex.code3: Working template XAML:
       <ComboBox ItemsSource="{Binding Path=ImprovementList}" DisplayMemberPath="refimprovement.name_full"<br>
           SelectedItem="{Binding Path=RecalcManualItem.cfaccimprovementlist, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"<br>
           SelectionChanged="ComboBox_SelectionChanged" /><br>

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Telerik team
answered on 05 Jul 2012, 11:32 AM
Hi Peter,

I've tried to reproduce the wrong behavior but I was not able to. Can you check the attached test project? Is there something specific on your side that I've missed? Also, more information about the machines where the wrong behavior is observed would be helpful.

All the best,
the Telerik team

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answered on 09 Jul 2012, 12:06 PM
Hi Yordanka, good for you
may be we have located problem. Strange behaviour appeare on machine with installed .NET Framework 4.5 RC. Certainly, it is inadmissible. We need you repair this bug.

With best regards,
Barbanyaga Peter.
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