DataFilter crashes if item text has underscore

[Mikel]

Hi,

Our client has reported an error produced on filter when item has any underscore. We are using Telerik 2012.2.607.40

If user clicks on checkboxes it filters items as expected but if user clicks on text it raises the following exception:

System.ArgumentNullException was unhandled

  Message=Value cannot be null.

Parameter name: element

  Source=Telerik.Windows.Controls

  ParamName=element

  StackTrace:

       at Telerik.Windows.Controls.ParentOfTypeExtensions.<GetParents>d__0.MoveNext() in c:\TB\117\WPF_Scrum\Release_WPF\Sources\Development\Core\Controls\Extensions\ParentOfTypeExtensions.cs:line 74

       at System.Linq.Enumerable.<OfTypeIterator>d__aa`1.MoveNext()

       at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)

       at Telerik.Windows.Controls.GridView.FilteringDropDown.ShouldCloseOnMouseButton(UIElement eventOriginalSource) in c:\TB\117\WPF_Scrum\Release_WPF\Sources\Development\Controls\GridView\GridView\GridView\Filtering\FilteringDropDown.cs:line 386

       at Telerik.Windows.Controls.GridView.FilteringDropDown.Telerik.Windows.Controls.IPopupWrapperOwner.ShouldCloseOnMouseButtonDown(UIElement eventOriginalSource) in c:\TB\117\WPF_Scrum\Release_WPF\Sources\Development\Controls\GridView\GridView\GridView\Filtering\FilteringDropDown.cs:line 376

       at Telerik.Windows.Controls.AutoClosePopupWrapper.OnPreviewMouseButtonDown(Object sender, MouseButtonEventArgs e) in c:\TB\117\WPF_Scrum\Release_WPF\Sources\Development\Core\Controls\Popup\AutoCloseWrapper\AutoClosePopupWrapper.cs:line 207

       at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)

       at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)

       at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
...

It is easy to reproduce with this code.

MainWindow.xaml

<Window x:Class="TestUnderscore.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:Controls="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView" Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Controls:RadGridView x:Name="RadGridView"/>
    </Grid>
</Window>

MainWindow.xaml.cs

namespace TestUnderscore
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            var items = new ObservableCollection<string>();
            for (int i = 0; i < 50; i++ )
            {
                items.Add("Item_" + i);
            }
            this.RadGridView.ItemsSource = items;
        }
    }
}