TabControls fails in Window

[Alan]

This works:

<Window
    x:Class="xxxxxx"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:telerik="using:Telerik.UI.Xaml.Controls" 
    mc:Ignorable="d">
    <Grid>
        <TabView>
            <TabView.TabItems>
                <TabViewItem Header="CMD Prompt"/>
                <TabViewItem Header="PowerShell"/>
                <TabViewItem Header="Windows Subsystem for Linux"/>
            </TabView.TabItems>
        </TabView>
    </Grid>
</Window>

This does not due to the following. Using all of the latest nuget packages (2.0). I suspect it is related to being in a Window vs a control:

Microsoft.UI.Xaml.Markup.XamlParseException
  HResult=0x802B000A
  Message=XAML parsing failed.
  Source=WinRT.Runtime
  StackTrace:
   at WinRT.ExceptionHelpers.<ThrowExceptionForHR>g__Throw|20_0(Int32 hr)

<Window
    x:Class="xxxxxx"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:telerik="using:Telerik.UI.Xaml.Controls" 
    mc:Ignorable="d">
    <Grid>
        <telerik:RadTabControl>
            <telerik:RadTabControl.Items>
                <telerik:RadTabItem Header="Tab 1" Content="The content of tab item 1"/>
                <telerik:RadTabItem Header="Tab 2" Content="The content of tab item 2"/>
                <telerik:RadTabItem Header="Tab 3" Content="The content of tab item 3"/>
                <telerik:RadTabItem Header="Tab 4" Content="The content of tab item 4"/>
            </telerik:RadTabControl.Items>
        </telerik:RadTabControl>
    </Grid>
</Window>

[Petar Mladenov]

Hello Alan,

We will need more information regarding this case. Could you please add the following details:

     - what type of application do you create - WinUI fir UWP / Desktop

     - which versions of VS and WinUI do you use ?

Can you send us the application if it is isolated one, not part of a bigger project ? Thank you in advance.

Regards,
Petar Mladenov
Progress Telerik

[Alan]

WinUI for desktop, latest version

VS 2022 CE, latest version

All nuget packages to date. I just replicated it on a clean project, which is attached.

 

[Petar Mladenov]

Thank you for your project.
Please check the getting started steps listed here:
https://docs.telerik.com/devtools/winui/getting-started/first-steps-nuget

I think the essential step you miss is 5 (adding styles for the telerik controls). Please give it a try and let us know how it goes.

[Alan]

Ok, that worked: thank you.

I am not sure what can be done here but the generic failure doesn't tell us what happened. I would suggest some other means of flagging it or loading it if not found.

[Petar Mladenov]

Hi Alan,
Thank you for this suggestion but I'm afraid this is an internal message in WinUI and we have no control at this level.