Tree in a DropDownButton blows up

[Scott Michetti]

Hello. I get the following error when trying to load items dynamically into a RadTreeView that's in a RadDropDownButton on a RadWindow.
"Error HRESULT E_FAIL has been returned from a call to a COM component."
If the tree is not on a window it works fine. Or, if the tree is not in the RadDropDownButton it also works fine.
Can you give me a workaround?
Thanks

Here's my code.

//C#

 

using

 

System;

 

using

 

System.Collections.Generic;

 

using

 

System.Linq;

 

using

 

System.Net;

 

using

 

System.Windows;

 

using

 

System.Windows.Controls;

 

using

 

System.Windows.Documents;

 

using

 

System.Windows.Input;

 

using

 

System.Windows.Media;

 

using

 

System.Windows.Media.Animation;

 

using

 

System.Windows.Shapes;

 

using

 

System.Windows.Navigation;

 

using

 

Telerik.Windows.Controls;

 

namespace

 

WindowTest2

 

{

 

public partial class MainPage : Page

 

 

 

 

{

 

public MainPage()

 

{

InitializeComponent();

btn.Click +=

new RoutedEventHandler(btn_Click);

 

 

RadTreeViewItem radTreeViewItem = new RadTreeViewItem();

 

radTreeViewItem.Header =

"All";

 

tvLocations.Items.Add(radTreeViewItem);

tvLocations.SelectedItem = radTreeViewItem;

 

}

 

void btn_Click(object sender, RoutedEventArgs e)

 

{

rwdFilters.ShowDialog();

}

 

}

}

//XAML
<navigation:Page
           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"
           mc:Ignorable="d"
           xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           xmlns:telerik="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls" xmlns:telerikNavigation="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Navigation" x:Class="WindowTest2.MainPage"
           d:DesignWidth="640" d:DesignHeight="480"
           Title="MainPage Page">
    <Grid x:Name="LayoutRoot">
  
  
  <telerikNavigation:RadWindow x:Name="rwdFilters" HorizontalAlignment="Right" Margin="0,0,0,0" VerticalAlignment="Top" Width="461" Height="384">
   <Canvas Width="450" Height="320">
    
    <telerik:RadDropDownButton x:Name="rddTree" Padding="0" DropDownWidth="215" DropDownHeight="300" Content="All" Width="200" HorizontalAlignment="Left" Height="20" VerticalAlignment="Top" Canvas.Left="140" Canvas.Top="120">
     <telerik:RadDropDownButton.DropDownContent>
      <telerikNavigation:RadTreeView x:Name="tvLocations" Height="299" Margin="0,0,0,0" VerticalAlignment="Bottom"/>
     </telerik:RadDropDownButton.DropDownContent>
    </telerik:RadDropDownButton>     
   </Canvas>
  </telerikNavigation:RadWindow>
  <telerik:RadButton x:Name="btn" Height="51" HorizontalAlignment="Left" Margin="33,23,0,0" VerticalAlignment="Top" Width="127" Content="Button"/>
    </Grid>
</navigation:Page>

[Miroslav Nedyalkov]

Hi Scott,

 Could you please open a support ticket and send us a sample project that reproduces the problem? This would help us investigate what the problem is.

Best wishes,
Miroslav Nedyalkov
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items.

[Miroslav Nedyalkov]

Hello Scott,

 I received the project. Here is the answer if somebody else hit the same problem:
I noticed that you placed the RadWindow control into the UserControl and this is not recommended. I moved the window to a separate XAML file (as a root tag) and this fixed the problem. Moving the window to separate XAML is demonstrated in our online example of the RadWindow control:  http://demos.telerik.com/silverlight/#Window/FirstLook.

Kind regards,
Miroslav Nedyalkov
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items.

[Scott Michetti]

Thanks. That fixed it.
Scott