An Unhanded Exception has occurred:In Design View on .net workspace

[Kasthuri]

Hi,
 Am get this error ie,An Unhanded Exception has occurred in .net 2010 work space.Were I can watch design view in blend. 
<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"
           xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk" x:Class="NexusMedical.Views.Page2"
           mc:Ignorable="d"
           d:DesignWidth="640" d:DesignHeight="480"
           Title="Page2 Page">
<navigation:Page.Resources>
<Style TargetType="ListBoxItem" x:Key="draggableItemStyle">
<Setter Property="HorizontalAlignment" Value="Stretch" />
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
<Setter Property="Foreground" Value="#000000" />
<Setter Property="telerik:RadDragAndDropManager.AllowDrag" Value="True" />
</Style>
<Style TargetType="telerik:RadTileViewItem" x:Key="pinned">
<Setter Property="Background" Value="#034e76" />
</Style>


</navigation:Page.Resources>
    <Grid x:Name="LayoutRoot">


    <Grid Margin="0">
    <telerik:RadTileView ColumnsCount="4"  
    IsItemsSizeInPercentages="True"
    MinimizedColumnWidth="250"
    PreservePositionWhenMaximized="True"
    RowHeight="Auto"
    telerik:TileViewPanel.IsColumnsShrinkEnabled="True"
    telerik:TileViewPanel.IsRowsShrinkEnabled="True"
    telerik:TileViewPanel.IsSizeBoundToPosition="True" Margin="0">
    <telerik:RadTileViewItem Header="RadTileViewItem" RestoredHeight="50"/>
    <telerik:RadTileViewItem Header="RadTileViewItem" RestoredHeight="50"/>
    <telerik:RadTileViewItem Header="RadTileViewItem" RestoredHeight="50"/>
    <telerik:RadTileViewItem Header="RadTileViewItem" RestoredHeight="100"/>
    <telerik:RadTileViewItem Header="RadTileViewItem" RestoredHeight="50"/>
    <telerik:RadTileViewItem Header="RadTileViewItem" RestoredHeight="50"/>
    <telerik:RadTileViewItem Header="RadTileViewItem" RestoredHeight="50"/>
    </telerik:RadTileView>
   

    </Grid>


    </Grid>
</navigation:Page>

also i have attached a screen short regarding this.pls do help me.

[Petar Mladenov]

Hi Kasthuri,

We managed to reproduce your issue and we logged two bugs in our PITS:
TileView: Desinger crashes when using RowHeight=Auto and IsItemSizeInPercentages = true
TileView: InvalidOperationExcetption in thrown in design time in certain situations
 where you are now able to track their status. We also updated your telerik account points as a thanks for your cooperation. You can workaround the InvalidOperationException by setting the RowHeight to some number, for example 150. Hope this is suitable for you.

Best wishes,
Petar Mladenov
the Telerik team