Problem with 2 RadChart

[Federico]

Hello,

I'm a beginner in Silverlight, so I have difficult using RadChart.
I made a Control with 2 Chart; running Debug, the project work fine, but when I open the control in design mode, I get the error "NullReferenceException: Object reference not set to an instance of an object" on the second chart, so I can visualize correctly the first Chart but not the second one.
If I delete one of two RadChart, I have no error.
 There is no difference if I delete the first one or the second one, or if I commute position placing the second one (secondRadChart) on the top and the other (firstRadChart) on the bottom: with one single chart I have no error, with two chart I get error on the one placed below.

I also tried to place both Chart in different StackPanel or in different Grid, but with no success.

This is a great problem for me: because of this error i can't open in design mode all page containing this control.
This is my XAML file:

<UserControl x:Class="MyProject.MyControl"

      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:converter="clr-namespace:MyProject"

      xmlns:telerikChart="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Charting"

      xmlns:chart="clr-namespace:Telerik.Windows.Controls.Charting;assembly=Telerik.Windows.Controls.Charting"

      mc:Ignorable="d"

      d:DesignHeight="500" d:DesignWidth="700">

<Grid x:Name="myGrid" ShowGridLines="False" Grid.Column="0" Grid.Row="1" Grid.RowSpan="2" Height="300">

 <Grid.RowDefinitions>

     <RowDefinition Height="150" />

     <RowDefinition Height="150" />

</Grid.RowDefinitions>

<Grid.ColumnDefinitions>

     <ColumnDefinition Width="*" />

</Grid.ColumnDefinitions>

 
<telerikChart:RadChart x:Name="firstRadChart" BorderThickness="0" 
    BorderBrush="Transparent" VerticalAlignment="Top"
     ItemsSource="{Binding myDataSource}" 
    Padding="0" Grid.Column="0" Grid.Row="0"

      Height="150" Width="640" 
    HorizontalAlignment="Center" Background="Transparent" >

</telerikChart:RadChart>

 
<telerikChart:RadChart x:Name="secondRadChart" BorderThickness="0" 
    BorderBrush="Transparent" VerticalAlignment="Top" 
    ItemsSource="{Binding myDataSource}"
    Padding="0" Grid.Column="0" Grid.Row="1" 
    Height="150" Width="700" 
    Background="Transparent" Foreground="Transparent">

</telerikChart:RadChart>

</Grid>

</UserControl>

Thanks a lot to everyone who help me!

Federico

[Rosko]

Hello Darren,

We suspect the error you are observing on your end is a different manifestation of a known Silverlight 5 design-time issue reported here and here (it does not matter whether your actual project uses Silverlight 4 or 5 as long as Silverlight 5 is installed on the workstation). If that is the case we would suggest you to install .NET4.5 Beta and that should resolve the design-time problem -- you can find the download here.

Let me elaborate a bit more why installing version of the full .NET framework fixes Silverlight design time issue -- Silverlight 5 itself (being technology for the Web) does no calls to the full .NET framework but its design-time support (as the one in WPF) does. Also, Silverlight 5 does not install .NET 4.5 and it should not install it -- the problem here is that some Microsoft design-time method calls erroneously rely on .NET 4.5 implementation and resolve properly only when .NET 4.5 is installed.

Regards,

Rosko

the Telerik team