This question is for Telerik UI for WPF, version R2 2022.  Development environment is Windows 10 Pro 64-bit, Visual Studio 2022 64-bit version 17.2.2.  WPF application targeting .NET Framework 4.8.

I use many Telerik RadExpanders throughout my application.  Rather than style the header of each one individually, I would like to apply a master style to the Application.xaml so it will apply to all of them.  

   An example of one of my RadExpanders is:

xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" 

        <telerik:RadExpander x:Name="radExpGeneral" IsExpanded="True" 
                             telerik:AnimationManager.IsAnimationEnabled="False" telerikControls:StyleManager.Theme="Office_Blue">
            <telerik:RadExpander.Header>
                <StackPanel Orientation="Horizontal">
                    <TextBlock Text="Steps"/>
                </StackPanel>
            </telerik:RadExpander.Header>
        </telerik:RadExpander>

   I'm attempting to style with the following in my Application.xaml:

xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" 

        <Style TargetType="{x:Type telerik:RadExpander}">
            <Style.Resources>
                <Style TargetType="{x:Type HeaderedContentControl}">
                    <Style.Resources>
                        <Style TargetType="{x:Type TextBlock}">
                            <Setter Property="FontSize" Value="12"/>
                            <Setter Property="FontWeight" Value="DemiBold"/>
                        </Style>
                    </Style.Resources>
                </Style>
            </Style.Resources>
        </Style>

   The idea is that this style first targets all RadExpanders, then targets only the header, then applies the style to the textblocks inside of it.  The problem seems to be targeting the header only, not the contents.  This style does not work.  Can anyone advise how to target just the radexpander headers?  Thank you!

Failed to focus RadWatermarkTextBox

<telerik:RadDropDownButton Margin="10 0" 
                        DropDownIndicatorVisibility="Collapsed"
                        DropDownPlacement="Mouse">
    <telerik:RadDropDownButton.DropDownContent>
        <StackPanel Orientation="Horizontal">
            <telerik:RadButton Click="AddLocation_OnClick"/>
            <telerik:RadWatermarkTextBox 
                    Width="100" 
                    Loaded="RadWatermarkTextBox_Loaded"/>
        </StackPanel>
    </telerik:RadDropDownButton.DropDownContent>
</telerik:RadDropDownButton>

Application simple crush when try to load this component. 
This can occur only on poor computers. 
What can be a problem ?  Any suggestion.

Event time    6/20/2022, 9:21:02.512 AM (Local time)    
Message    System.OutOfMemoryException: Eine Ausnahme vom Typ "System.OutOfMemoryException" wurde ausgelöst.    
Exception type    System.OutOfMemoryException    
Failed method    Telerik.Windows.Controls.AutomationExtensions.GetBaseControlItemStatus    
Problem Id    System.OutOfMemoryException at Telerik.Windows.Controls.AutomationExtensions.GetBaseControlItemStatus    
Assembly    Telerik.Windows.Controls, Version=2019.1.220.45, Culture=neutral, PublicKeyToken=5803cfa389c90ce7    
Severity level    Critical    
Telemetry type    exception    
Device type    PC    
Client IP address    0.0.0.0    
Country or region    United Kingdom    
Role instance    DEM5CG9125VHX.int.cpaglobal.net    
SDK version    nlog:2.17.0-146    
Sample rate    1    
Custom Properties
LoggerName    error    
threadid    1    
Message    A fatal error has occured. The application will be terminated.    

System.OutOfMemoryException:
   at System.Text.StringBuilder..ctor (mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089)
   at System.Windows.ThicknessConverter.ToString (PresentationFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Thickness.ToString (PresentationFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at Telerik.Windows.Controls.AutomationExtensions.GetBaseControlItemStatus (Telerik.Windows.Controls, Version=2019.1.220.45, Culture=neutral, PublicKeyToken=5803cfa389c90ce7)
   at Telerik.Windows.Automation.Peers.GridViewDataControlAutomationPeer.GetItemStatusCore (Telerik.Windows.Controls.GridView, Version=2019.1.220.45, Culture=neutral, PublicKeyToken=5803cfa389c90ce7)
   at Telerik.Windows.Automation.Peers.RadGridViewAutomationPeer.GetItemStatusCore (Telerik.Windows.Controls.GridView, Version=2019.1.220.45, Culture=neutral, PublicKeyToken=5803cfa389c90ce7)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.ContextLayoutManager.fireAutomationEvents (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.ContextLayoutManager.UpdateLayout (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.UIElement.UpdateLayout (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Interop.HwndSource.Process_WM_SIZE (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Interop.HwndSource.LayoutFilterMessage (PresentationCore, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at MS.Win32.HwndWrapper.WndProc (WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation (WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall (WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen (WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35)

How can I go through the Appointment list and know if the appointment is happening today.

Of course that includes all the limitations of Recurrence and ExceptionOccurence, I want to know the bottom line whether it is happening today or not.

Would appreciate help

How to reproduce:

To simplify the problem, I used a basic RadGridView and implemented a horizontal mouse wheel scrolling like so:

  private void GridView_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
        {
            if (((RadGridView)sender).ChildrenOfType<ScrollViewer>().FirstOrDefault() is ScrollViewer scrollViewer)
            {
                if (Keyboard.Modifiers.Equals(ModifierKeys.Shift))
                {
                    if (e.Delta < 0)
                    {
                        scrollViewer.LineRight();
                    }
                    else
                    {
                        scrollViewer.LineLeft();
                    }
                    e.Handled = true;
                }
            }
        }

I used the solution found in this thread and added the code above.

https://www.telerik.com/forums/horizontal-scrolling-w-mouse-wheel-trackpad

Horizontal mouse wheel scrolling works fine until I open the text search (Ctrl + F). After opening the search bar, the ScrollViewer seems to be changed in a way that scrolling with the mouse wheel + shift behavior is not working anymore.

I would be very grateful for any help.

Best regards

Jonas

Hi,

The  RadCalculatorPicker is a great option to provide spreadsheet-like input for the user. You can open the calculator by hitting the down-arrow key, but once opened the only way to close is to click on the button again. Typically the user will be entering on the keyboard, typing in the formula rather than clicking it in, making this pretty cumbersome.

Is there a way to automatically close the popup when hitting enter, an event I can intercept?

Regards

Renier

Hi,

I use RadGridView component, that I want to clean and reuse with different data in code behind (for example by clicking on button).
So what am I doing is calling a clear on all Columns (RadGridView.Columns.Clear()) and then I will start adding new columns for different data.

But the problem is when I use it with GridViewColumnGroup the clearing or adding new Columns takes an long time (seconds or minutes for test example where I have 500 Columns and 50 ColumnGroups).
Even if I add ColumnGroups before adding Columns, it will only slightly improve the situation. 

This slow processing occurs only after component has been displayed at least once. If the component was not already loaded (shown) it takes almost no time.

I tried hidding component before this process, or unsetting ItemsSource, but nothing helped.

Thank you for any help.

Edit:
I added image of Callstack, when i call Clear() method on Columns:

We have observed that minimized Telerik window/control is not showing few characters of title. We would like to see the few characters of window title even in minimized state. Do we have any property to control the width of minimized window?

Thanks in advance,

Manohar

Hello,

My question is: how to prevent click on disabled cells?

I have some disabled cells in my RadGridView (their "IsEnabled" property is set to false), yet when I click on them, it actually adds a border around the very first cell of the corresponding row, setting it in an "unfocused" state:

On this screenshot, I clicked in the bottom right cell and it set a white border around test2.
How to avoid this? In my opinion, clicking on a disabled cell should have no effect at all.

Thanks,
Arthur

Hello,

I am using the MVVM style on a RadRichTextBox and the XamlDataProvider (using a view model to populate the Xaml through binding). The problem is that I also want to be able to scroll the box after I set the Xaml, preferably as a percentage of the total possible scroll. I can get it to scroll down but then it goes right back.

Any thoughts?