Question about Groups in RadGrid

[Guillermo Aquino]

I'm using a RadGridView for Silverlight - version Q2 2010
Firstly, my Grid hasn't groups, 
My problem is that when i do the first grouping then items.groups property has a exception

+  base {System.InvalidCastException: Impossible d'effectuer un cast de l'objet de type 'Telerik.Windows.Examples.Customers' en type 'Telerik.Windows.Data.AggregateFunctionsGroup'.
  
On the other hand if i delete and re-create the same group, this error is not showing.

Thanks
Guillermo

[Pavel Pavlov]

Hi Guillermo Aquino,

I will try to reproduce  the error here , can you please paste me your code ( XAML and codebehind ) , so that I can try build a small test app and see what is wrong.  What I need is the XAML definition of RadGridView as well as the code-behind so I can see how do you bind RadGridView.

Best wishes,
Pavel Pavlov
the Telerik team

[Guillermo Aquino]

Hi
for my test, I'm using the RowNumber Gridview Example for "RadControls for Silverlight Q2 2010".

XAML

<Examples:GridViewExample x:Class="Telerik.Windows.Examples.GridView.RowNumber.Example"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:Examples="clr-namespace:Telerik.Windows.Examples"

xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"

xmlns:custom="clr-namespace:Telerik.Windows.Examples.GridView.RowNumber">

<Grid>

<Image Source="/GridView;component/Images/bg02.jpg" />

<telerik:RadGridView x:Name="RadGridView1" ItemsSource="{Binding Customers}" AutoGeneratingColumn="RadGridView1_AutoGeneratingColumn">

<telerik:RadGridView.Columns>

<custom:MyColumn Header="#" Width="50" />

</telerik:RadGridView.Columns>

</telerik:RadGridView>

</Grid>

</Examples:GridViewExample>

Code-Behind

using Telerik.Windows.Data;

using System.ComponentModel;

using Telerik.Windows.Controls;

namespace Telerik.Windows.Examples.GridView.RowNumber

{

/// <summary>

/// Interaction logic for Example.xaml

/// </summary>

public partial class Example

{

public Example()

{

InitializeComponent();

this.RadGridView1.Grouped += new System.EventHandler<Controls.GridViewGroupedEventArgs>(RadGridView1_Grouped);

}

private void RadGridView1_Grouped(object sender, GridViewGroupedEventArgs e)

{

DataItemCollection dic = RadGridView1.Items;


}

private void RadGridView1_AutoGeneratingColumn(object sender, Telerik.Windows.Controls.GridViewAutoGeneratingColumnEventArgs e)

{

if (e.Column.UniqueName == "Order" || e.Column.UniqueName == "Product")

{

e.Cancel = true;

}

}

}

}

Thanks
  Guillermo

[Guillermo Aquino]

Any solutions?

[Vlad]

Hello Guillermo,

We were able to identify the problem and this issue will be fixed for our official release (next week). I've added 2000 Telerik points to your account.

Regards,
Vlad
the Telerik team