Hi,

I encountered the same issue as this - https://www.telerik.com/forums/radopenfolderdialog-is-super-slow

May I ask if there is any solution to date?

Regards

I want to customize GroupDescription to meet our needs. Here is the `EquipmentGroupDescription` class: public class EquipmentGroupDescription : GroupDescription { public override object GroupNameFromItem(object item, int level, CultureInfo culture) { var experiment = item as Experiment; if (experiment == null) return null; return experiment.EquipmentID; } } The `Experiment` class inherits from `Appointment`: public class Experiment : Appointment { public string ID { get; set; } public string Name { get; set; } public string EquipmentName { get; set; } public Guid EquipmentID { get; set; } } I need to group `Experiment` by `EquipmentID` and `DateTime`. Here is the XAML: <telerik:RadScheduleView x:Name="scheduler" ActiveViewDefinitionIndex="1" FirstVisibleTime="12:00" GroupDescriptionsSource="{Binding CustomGroupDescriptions}" AppointmentsSource="{Binding Experiments}"> <telerik:RadScheduleView.GroupHeaderContentTemplate> <DataTemplate> <TextBlock Text="{Binding}" Foreground="White" FontWeight="Bold"/> </DataTemplate> </telerik:RadScheduleView.GroupHeaderContentTemplate> <telerik:RadScheduleView.AppointmentItemContentTemplate> <DataTemplate> <StackPanel> <TextBlock Text="{Binding Appointment.Name}" FontWeight="Bold" Foreground="White"/> <TextBlock Text="{Binding Appointment.EquipmentName}" Foreground="#DDD"/> </StackPanel> </DataTemplate> </telerik:RadScheduleView.AppointmentItemContentTemplate> <telerik:RadScheduleView.ViewDefinitions> <telerik:DayViewDefinition /> <telerik:WeekViewDefinition /> <telerik:MonthViewDefinition /> <telerik:TimelineViewDefinition DayStartTime="08:00" /> </telerik:RadScheduleView.ViewDefinitions> </telerik:RadScheduleView> ``` In the ViewModel,

private readonly Guid pivot1 = Guid.NewGuid();
private readonly Guid pivot2 = Guid.NewGuid();

var items = LoadAppointmentsSource();
Experiments = items.ToObservableCollection();
CustomGroupDescriptions = new ObservableCollection<EquipmentGroupDescription>
    {
        new EquipmentGroupDescription()
    };

private IEnumerable<Experiment> LoadAppointmentsSource()
{
    var items = new List<Experiment>
    {
        new Experiment()
        {
            Subject="1",
            Name="K Experiment 1",
            EquipmentID=pivot1,
            EquipmentName="Pivot",
            Start=DateTime.Today.AddDays(1).AddHours(12),
            End=DateTime.Today.AddDays(1).AddHours(13)
        },
        new Experiment()
        {
            Subject="2",
            Name="K Experiment 2",
            EquipmentID=pivot2,
            EquipmentName="Pivot",
            Start=DateTime.Today.AddDays(1).AddHours(12),
            End=DateTime.Today.AddDays(1).AddHours(13)
        },
    };
    var firstDate = items.Min(new Func<Experiment, DateTime>(p => p.Start.Date));

    var firstDay = CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek;
    var dayOfWeekNumber = (int)DateTime.Today.DayOfWeek == 0 ? 7 : (int)DateTime.Today.DayOfWeek;
    var firstDayOfCurrentWeek = DateTime.Today.Subtract(TimeSpan.FromDays(dayOfWeekNumber - (int)firstDay));

    var offset = firstDayOfCurrentWeek - firstDate;

    foreach (var item in items)
    {
        item.Start += offset;
        item.End += offset;
    }

    return items;
}

private ObservableCollection<Experiment> experiments;

public ObservableCollection<Experiment> Experiments
{
    get { return experiments; }
    set
    {
        experiments = value;
        OnPropertyChanged();
    }
}

private ObservableCollection<EquipmentGroupDescription> customGroupDescriptions;

public ObservableCollection<EquipmentGroupDescription> CustomGroupDescriptions
{
    get { return customGroupDescriptions; }
    set
    {
        customGroupDescriptions = value;
        OnPropertyChanged();
    }
}

the Telerik version used is 2022.3.912.310. During debugging, I found that `GroupDescriptionsSource`

contains two objects: `EquipmentGroupDescription` and `DatetimeGroupDescription`.

However, `EquipmentGroupDescription` has 0 items in `GroupNames`, and its `GroupNameFromItem`

method is never called.

I currently have an RadAutoCompelteBox similar to this:

        <telerik:RadAutoCompleteBox  x:Name="MyGrid"
                                 KeyDown="OnSearchBoxKeyDown"
                                 SearchTextChanged="OnSearchTextChanged"
                                 ItemsSource="{Binding Source={StaticResource ViewModel}}, Path=Data.MyData"
                                 SelectionMode="Single"
                                 DisplayMemberPath="Display"
                                 TextSearchPath="MyNumber"
                                 SelectedItem="{Binding SelectedItem, Mode=TwoWay}"
                                 SearchText="{Binding SearchText, Mode=TwoWay}"
                                 TextSearchMode="Contains"
                                 DropDownItemTemplate="{StaticResource MyDropDownTemplate}">
            <telerik:RadAutoComplete.FilteringBehavior>
                <telerik:AsyncFilteringBehavior/>
            </telerik:RadAutoComplete.FilteringBehavior>
        </telerik:RadAutoCompleteBox>

What is happening is this.
View the view loads we load the selected item has it has a value. (Say "123456").

When the user clicks on the autocompeltebox the whole selection highlights. (That's fine)
User then clicks it a second time and the cursor is then at the end of the 6 in my example.
User then clicks backspace and the entire selection clears out. 

At that point why would it not just remove the 6?

        private void OnSearchTextChanged(object sender, EventArgs e)
        {
            // Try to capture this and do what I want.
        }

I've tried to use this method to achieve what I want to happen, however the EventArgs is always empty.

How can I accomplish this? (I want the backspace to clear one character at a time)

I will note that we have other AutoCompleteBoxes that work as intended the only difference between those ones and this one is that the ones that work have all the data loaded up front in the ItemsSource.
This one we are searching the DB for the data as the user types.

I just found a 15 year old post about RadComboBox filtering and virtualization not working

I cant understand why this hasn't been fixed yet ? 

GridView supports filtering and virtualization, so it's not like you dont know how to fix it.

You ESPECIALLY need virtualization AND filtering when you have 1000+ elements in your ComboBox like i do, 

we have a list of 3000 companies that i want to use in a selector...

it's only after completly abandonding RadComboBox and using the RadAutocompleterBox that i was able to achieve what i wanted - kind of. 

Could you PLEASE prioritize this missing feature ?

I am using the RadTimeSpanPicker to choose a duration, and I'd like to style the Clear and Close buttons to match the Run New Objective button.  How can I access the button styles?

Thanks,

Chuck

Hi,

  I have rad grid view with Grouping along with Select checkbox (GridviewCheckboxcolum). I need below help

1. I need to know how we can achieve Select all functionality on Grid as well ex: If i select check box column in header it has to select all the rad Gridview groups as well
2. I also need to know how can achieve group filtering as well
3. How we can achieve sorting with Group Names?

Thanks in advance

I have just updated the .dlls from 2020.1 to the latest version (2025.1.211).

Now, the formatting only works for the top level.

Before:

After:

The blue rows are top level and work as expected, any row in any level below does not use the format string.

The TreeListView is defined with an ItemsSource:

<telerik:RadTreeListView
      (...)
      ItemsSource="{Binding ... }" >

The columns are defined like this:

<telerik:GridViewDataColumn
       DataMemberBinding="{Binding ...}"
       IsReadOnlyBinding="{Binding ...}"
       DataFormatString="{}{0:#,###;-#,###;#}"
       CellStyleSelector="{StaticResource CellStyleSelector}"
       ShowDistinctFilters="False"
       Width="80"
       Header="...">
       <telerik:GridViewDataColumn.Footer>
           <TextBlock
               Text="{Binding ...}" />
        </telerik:GridViewDataColumn.Footer>
</telerik:GridViewDataColumn>

I have not found anything new in the documenation. Am I missing something?

Thanks and best regards,
Manuel