Questions on UI for WPF Forum

1 answer

28 views

RadComboBox REALLY needs to support filtering AND virtualization !

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 ?

ComboBox

answered on 26 May 2025

1 answer

32 views

RadGridView - Grid with 2 or more Footers

I currently have a function grid similar to:

<telerik:RadGridView Grid.Row="2" Grid.ColumnSpan="2" x:Name="MyGridView"
                     ItemsSource="{Binding MyItems}"
                     RowIndicatorVisibility="Collapsed"
                     ShowColumnFooters="True"
                     ShowGroupPanel="False"
                     IsReadOnly="True"
                     HorizontalContentAlignment="Stretch"
                     VerticalAlignment="Top">
    <telerik:RadGridView.Columns>
        <telerik:GridViewDataColumn DataMemberBinding="{Binding MonthDisplay}" Header="Month" Width="65">
            <telerik:GridViewDataColumn.Footer>
                <TextBlock Text="Totals:"/>
            </telerik:GridViewDataColumn.Footer>
        </telerik:GridViewDataColumn>
        <telerik:GridViewDataColumn DataMemberBinding="{Binding Column1Data}" Header="Column 1" Width="*" MinWidth="40" MaxWidth="95" DataFormatString="#,###0.##" TextAlignment="Right" FooterTextAlignment="Right">
            <telerik:GridViewDataColumn.AggregateFunctions>
                <telerik:SumFunction/>
            </telerik:GridViewDataColumn.AggregateFunctions>
        </telerik:GridViewDataColumn>
        <telerik:GridViewDataColumn DataMemberBinding="{Binding Column2Data}" Header="Column 2" Width="*" MinWidth="40" MaxWidth="95" DataFormatString="#,###0.##" TextAlignment="Right" FooterTextAlignment="Right">
            <telerik:GridViewDataColumn.AggregateFunctions>
                <telerik:SumFunction/>
            </telerik:GridViewDataColumn.AggregateFunctions>
        </telerik:GridViewDataColumn>
        <telerik:GridViewDataColumn DataMemberBinding="{Binding Column3Data}" Header="Column 3" Width="*" MinWidth="40" MaxWidth="95" DataFormatString="#,###0.##" TextAlignment="Right" FooterTextAlignment="Right">
            <telerik:GridViewDataColumn.AggregateFunctions>
                <telerik:SumFunction/>
            </telerik:GridViewDataColumn.AggregateFunctions>
        </telerik:GridViewDataColumn>
        <telerik:GridViewDataColumn DataMemberBinding="{Binding Column4Data}" Header="Column 4" Width="*" MinWidth="40" MaxWidth="95" DataFormatString="#,###0.##" TextAlignment="Right" FooterTextAlignment="Right">
            <telerik:GridViewDataColumn.AggregateFunctions>
                <telerik:SumFunction/>
            </telerik:GridViewDataColumn.AggregateFunctions>
        </telerik:GridViewDataColumn>
    </telerik:RadGridView.Columns>
</telerik:RadGridView>

So the grid would show results like:

Month	Column1	Column2	Column3	Column4
Jan	1	2	3	4
Feb	1	2	3	4
March	1	2	3	4
Totals:	3	6	9	12

What I now want to do is add another footer row so that the grid would look like:

Month	Column1	Column2	Column3	Column4
Jan	1	2	3	4
Feb	1	2	3	4
March	1	2	3	4
Totals:	3	6	9	12
Average:1	2	3	4

Is it possible to add a 2nd footer row and if so how can I accomplish that?

GridView

answered on 26 May 2025

1 answer

47 views

SelectedItem of RadListBox reset when unloading?

Hello!

I have exactly this problem reported on this post: https://www.telerik.com/forums/selecteditem-reset-when-unloading but using RadListBox.

Do you know of any solutions other than setting DataContext explicitly? This workaround worked on some controls but not on others.

ListBox

answered on 26 May 2025

2 answers

52 views

How do you style the Clear and Close buttons on a RadTimeSpanPicker?

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

Styling

answered on 22 May 2025

2 answers

85 views

How do I silence these Telierk build messages.?

We build using the Telerik UI for WPF NuGet Packages from your NuGet server. Since I updated all our Telerik NuGet package references from a 2024 version to the most current 2025 version, I am now receiving licensing messages during my build process. A lot of licensing messages. They tend to look like this:

17>[Telerik and Kendo UI Licensing]
17>      Telerik and Kendo UI License Key found at: C:\Users\joe\AppData\Roaming\Telerik\telerik-license.txt (UserDirectory)
17>      License issued at 2025-02-25 to j*******@g*******.com.
17>[Telerik and Kendo UI Licensing]

And they are all over the place.

Please tell me that there is a way that I can silence these messages

They make it more difficult to locate the build output lines that I am truly interested in. I don't need this information but if it must be output I don't need it this many times.

General Discussions

answered on 22 May 2025

0 answers

19 views

Filter and Select on RadGridview

Hi,

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

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
I also need to know how can achieve group filtering as well
How we can achieve sorting with Group Names?

Thanks in advance

GridView

asked on 22 May 2025

1 answer

27 views

DataFormatString only works for top level in TreeListView

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

TreeListView

answered on 21 May 2025

0 answers

49 views

PivotGridFieldList Row Filter causes null exception when underlying filter data has null values

Using 2024.1.423 PivotGrid and PivotGridFieldList, when trying to do a row filter on a column that has null values, Telerik.Windows.Controls.FieldList.Editing.Selectable.GetHashCode() will error with a NullReferenceException. This works when doing a label filter on a row or column though since the pivotgrid and the PivotGridFieldList use different methods of getting the distinct values.

Any way to fix it without having to modify the underlying data?

Thanks,

Patrick

PivotGrid

asked on 13 May 2025

1 answer

30 views

MultiColumnComboBox - Hitting escape then tab still selects last highlighted item

When the user is using the MultiColumnComboBox, if they open the combo box, then use the arrow keys to highlight a row in the grid, but then change their mind and hit escape to close the dropdown, then want to move to the next field so they hit tab, it then selects the last record that was highlighted in the grid. This seems like a bug to me. The docs for this control say "Escape: Pressing Escape will close the DropDown and the matched item would not be selected."

If the user can't tab out of the field without selecting a record, how can they leave the field without selecting a record with just the keyboard?

I was able to duplicate this functionality in the demo app. See zipped GIF in the attachments.

MultiColumnComboBox

answered on 13 May 2025

0 answers

27 views

Performance issue when closing RadTabItem

Hello Telerik Team,
We have a close button in RadTabItem and all the tab items are added from the list in the ViewModel.
On clicking of the close button, the particular item will be removed from the list in the ViewModel that reflects in the UI.
Here we are having a scenario in which if the RadTabItem content is heavily loaded, then it takes more time to close.
Please suggest a way to avoid the performance issue while closing the RadTabItem.

The Telerik Version we are used are 2023.2.718

Thanks and Regards,
Muhammad Azhar Shah
Technical Lead

TabControl

asked on 13 May 2025