Questions on UI for WPF Forum

1 answer

243 views

telerik contols invisible on vs 2019 designer (.Net 5)

Hi telerik,

I've created .Net 5 project , however telerik controls can't be seen on xaml designer, although wpf default controls are shown well. On running, all controls are seen and working without problem.

With the help of many threads regarding this subject , I found your reply how to remove designer cache and set the extension option,etc. While I did all steps as you said, no success yet.

My situation is as follows,

- telerik 2021.2.615 and vs2019 16.10.2 installed.

- projects are created as WPF 5.0 project, not by tererik wpf template because it only support till .net 4.5.

Projects target is 'ANY CPU'.

- NoXaml dlls are copied to solution folder from installed directory, and all projects referenced those.

Double checked that no cross referenced dll exists between NoXaml and Xaml dlls.

During checking, I found that toolbox configuratIon supports only .net 4.5. as attached image.

Does that mean that I missed something ? so designer failed to load telerik controls ?

TIA

Kang

General Discussions

answered on 02 Jul 2021

1 answer

168 views

Error "Empty GridView Message Content" in GridView SDK

Hello.

I am trying to use Empty GridView Message Content of GridView in SDK.

I saw an error when using GridView Empty inside a TabControl.

How do I solve this part?

EmptyGridViewMessageBehavior.cs

private void InsertAdditionalContentControl()
{
    if (this.additionalContentControl.Content != this.messageContent)
    {
        this.additionalContentControl.Content = this.messageContent;
    }

    var rootGrid = this.gridView.FindChildByType<Grid>(); // rootGrid is Null.
    rootGrid.Children.Add(this.additionalContentControl); // System.NullReferenceException
} 
//If I put TabControl, TabItem instead of Grid in FindChildByType<Grid>, rootGrid.Children could not be resolved.

Thanks.

GridView

answered on 01 Jul 2021

0 answers

288 views

RadTreeView Index out of range when try to expand node

Hi.
I get Index out of range when try to expand node in my RadTreeview.

I expand and select two items,
Then I try to expand a different node (same root but different branch) and I get the error:

System.IndexOutOfRangeException
HResult=0x80131508
Message=Index was outside the bounds of the array.
Source=Telerik.Windows.Controls.Navigation
StackTrace:
at Telerik.Windows.Controls.TreeView.IndexTree.CumulativeValue(Int32 endIndex)
at Telerik.Windows.Controls.TreeView.TreeViewPanel.ExtendDesiredSize(ItemsControl itemsControl, Size stackDesiredSize, Int32 pivotIndex, Boolean before)
at Telerik.Windows.Controls.TreeView.TreeViewPanel.MeasureOverride(Size constraint)
at System.Windows.FrameworkElement.MeasureCore(Size availableSize) in /_/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/FrameworkElement.cs:line 4406
at System.Windows.UIElement.Measure(Size availableSize) in /_/src/Microsoft.DotNet.Wpf/src/PresentationCore/System/Windows/UIElement.cs:line 658
at System.Windows.ContextLayoutManager.UpdateLayout() in /_/src/Microsoft.DotNet.Wpf/src/PresentationCore/System/Windows/LayoutManager.cs:line 315
at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg) in /_/src/Microsoft.DotNet.Wpf/src/PresentationCore/System/Windows/LayoutManager.cs:line 583
at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks() in /_/src/Microsoft.DotNet.Wpf/src/PresentationCore/System/Windows/Media/MediaContext.cs:line 1968
at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget) in /_/src/Microsoft.DotNet.Wpf/src/PresentationCore/System/Windows/Media/MediaContext.cs:line 1845
at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget) in /_/src/Microsoft.DotNet.Wpf/src/PresentationCore/System/Windows/Media/MediaContext.cs:line 1746
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) in /_/src/Microsoft.DotNet.Wpf/src/WindowsBase/MS/Internal/Threading/ExceptionWrapper.cs:line 137
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler) in /_/src/Microsoft.DotNet.Wpf/src/WindowsBase/MS/Internal/Threading/ExceptionWrapper.cs:line 46
at System.Windows.Threading.DispatcherOperation.InvokeImpl() in /_/src/Microsoft.DotNet.Wpf/src/WindowsBase/System/Windows/Threading/DispatcherOperation.cs:line 549
at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj) in /_/src/Microsoft.DotNet.Wpf/src/shared/MS/Internal/CulturePreservingExecutionContext.cs:line 216
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) in /_/src/libraries/System.Private.CoreLib/src/System/Threading/ExecutionContext.cs:line 215
--- End of stack trace from previous location ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() in /_/src/libraries/System.Private.CoreLib/src/System/Runtime/ExceptionServices/ExceptionDispatchInfo.cs:line 56
at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state) in /_/src/Microsoft.DotNet.Wpf/src/shared/MS/Internal/CulturePreservingExecutionContext.cs:line 183
at System.Windows.Threading.DispatcherOperation.Invoke() in /_/src/Microsoft.DotNet.Wpf/src/WindowsBase/System/Windows/Threading/DispatcherOperation.cs:line 455
at System.Windows.Threading.Dispatcher.ProcessQueue() in /_/src/Microsoft.DotNet.Wpf/src/WindowsBase/System/Windows/Threading/Dispatcher.cs:line 2105
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) in /_/src/Microsoft.DotNet.Wpf/src/WindowsBase/System/Windows/Threading/Dispatcher.cs:line 2340
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) in /_/src/Microsoft.DotNet.Wpf/src/shared/MS/Win32/HwndWrapper.cs:line 330
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) in /_/src/Microsoft.DotNet.Wpf/src/shared/MS/Win32/HwndSubclass.cs:line 433
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) in /_/src/Microsoft.DotNet.Wpf/src/WindowsBase/MS/Internal/Threading/ExceptionWrapper.cs:line 137
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler) in /_/src/Microsoft.DotNet.Wpf/src/WindowsBase/MS/Internal/Threading/ExceptionWrapper.cs:line 46
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) in /_/src/Microsoft.DotNet.Wpf/src/WindowsBase/System/Windows/Threading/Dispatcher.cs:line 1342
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) in /_/src/Microsoft.DotNet.Wpf/src/shared/MS/Win32/HwndSubclass.cs:line 378
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) in /_/src/Microsoft.DotNet.Wpf/src/WindowsBase/System/Windows/Threading/Dispatcher.cs:line 2135
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) in /_/src/Microsoft.DotNet.Wpf/src/WindowsBase/System/Windows/Threading/Dispatcher.cs:line 329
at System.Windows.Threading.Dispatcher.Run() in /_/src/Microsoft.DotNet.Wpf/src/WindowsBase/System/Windows/Threading/Dispatcher.cs:line 297
at System.Windows.Application.RunDispatcher(Object ignore) in /_/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Application.cs:line 2405
at System.Windows.Application.RunInternal(Window window) in /_/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Application.cs:line 1695
at System.Windows.Application.Run() in /_/src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Application.cs:line 198
at NsModules.App.Main()

This exception was originally thrown at this call stack:
Telerik.Windows.Controls.TreeView.IndexTree.CumulativeValue(int)
Telerik.Windows.Controls.TreeView.TreeViewPanel.ExtendDesiredSize(System.Windows.Controls.ItemsControl, System.Windows.Size, int, bool)
Telerik.Windows.Controls.TreeView.TreeViewPanel.MeasureOverride(System.Windows.Size)
System.Windows.FrameworkElement.MeasureCore(System.Windows.Size) in FrameworkElement.cs
System.Windows.UIElement.Measure(System.Windows.Size) in UIElement.cs
System.Windows.ContextLayoutManager.UpdateLayout() in LayoutManager.cs
System.Windows.ContextLayoutManager.UpdateLayoutCallback(object) in LayoutManager.cs
System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks() in MediaContext.cs
System.Windows.Media.MediaContext.RenderMessageHandlerCore(object) in MediaContext.cs
System.Windows.Media.MediaContext.RenderMessageHandler(object) in MediaContext.cs
...
[Call Stack Truncated]

If I invert the order of selection the error don't raise.

In the figure: first I select the node in yellow, then I click in the arrow in red

TreeView

updated question on 01 Jul 2021

1 answer

194 views

RadAutoCompleteBox ItemControl's timing issue.

Hello.

When using RadAutoCompleteBox, an error occurs in the debug output if the tab is changed.

[System.Windows.Data Error: 26 : ItemTemplate and ItemTemplateSelector are ignored for items already of the ItemsControl's container type; Type='RadWatermarkTextBox']

The issue has been around for a long time. I heard it's a wpf timing issue.

I also found this issue on the feedback portal.
https://feedback.telerik.com/wpf/1351336-a-binding-error-is-printed-in-the-output-on-start-up-for-elementname-watermarktextbox

Are you still using the above post and can't fix it?

Thanks.

AutoCompleteBox

answered on 01 Jul 2021

3 answers

411 views

RadGrid ... Header to expand multiple columns?

Similar to how Excel works, I'm looking for a way to have header text span multiple columns ... see image. Also needs to work with a "Freeze/scrolling" RadGrid.

Cheers, Rob.

GridView

answered on 30 Jun 2021

0 answers

120 views

RadDocumentPane looses the header at NoXaml.

Hello, telerik.

When using NoXaml, RadDocumentPane looks loosing the header as attached picture.

It shows without problem when changing projects into dlls with Xaml as attached image.

Following theme xamls are added on project start.

Controls.Add("System.Windows.xaml");
Controls.Add("Telerik.Windows.Controls.xaml");
Controls.Add("Telerik.Windows.Controls.Navigation.xaml");
Controls.Add("Telerik.Windows.Controls.Input.xaml");
Controls.Add("Telerik.Windows.Controls.GridView.xaml");
Controls.Add("Telerik.Windows.Controls.RibbonView.xaml");
Controls.Add("Telerik.Windows.Controls.Docking.xaml");

Did I miss something another xaml ?

My project information is as follwos;

- telerik 2021.2.615, vs 2019.

- .Net 5 (WPF50 dlls used in installed folder).

Thanks.

Kang

Docking

asked on 30 Jun 2021

0 answers

313 views

Double Click on Item in ExplorerControl triggers rename instead of default action (open)

Hello,

when the user double clicks an item in the ExplorerControl a rename is initiated (see attached screenshot). This is usually expected to happen on a slow double click. On a normal double click users expect the file to be opened. The right click context menu also indicates this behavior as the open action is shown bold (and rename is not). So this is a little bit inconsistent and looks like a bug.

For the WinForms Version I found a workaround here: https://www.telerik.com/forums/few-question-on-explorercontrol#5122863

But the WPF Explorer Control is missing a ItemMouseDoubleClick event, so what is the best way to get the expected behavior?

Best regards, Philipp

FileDialogs

asked on 30 Jun 2021

1 answer

324 views

RadTabControl - lazily load declaritive content

Hi,

In Silverlight I believe the RadTabControl will lazily load the content of a RadTabControl when the RadTabItems are declared in the Xaml. In WPF I seems to eager load all the items on loading the control. Is it possible to configure the RadTabControl to only instantiate the RadTabItem content when the tab is selected to improve performance?

Thanks

TabControl

answered on 30 Jun 2021

2 answers

201 views

How to for RadTileList binding images?

I have List(of objects) and the definition of the Object is Name (string) FileName (string) that I set to the ItemSource of a RadTileList. Here is the control definition in XML:

        <telerik:RadTileList x:Name="tlColorPresets" Grid.Row="1" Grid.Column="1" Width="600">
            <telerik:RadTileList.ItemTemplate>
                <DataTemplate>
                    <Grid Background="#FF006AC1">
                        <Grid.RowDefinitions>
                            <RowDefinition />
                            <RowDefinition />
                        </Grid.RowDefinitions>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition/>
                        </Grid.ColumnDefinitions>
                        <TextBlock Grid.Row="0" Grid.Column="0" Text="{Binding Name}"/>
                        <Image Grid.Row="1" Grid.Column="0" Source="{Binding ImageFileName}" />
                    </Grid>
                </DataTemplate>
            </telerik:RadTileList.ItemTemplate>
        </telerik:RadTileList>