Problem with separate delete button

[Aiden]

I have problem with a Delete button that I added beside this GridView. At the runtime its IsEnabled property goes "false"!
would you please help me to figure it out, why?

Here is the XAML Code:

<telerik:RadGridView Margin="12,12,12,68" Name="radGridView1" AutoGenerateColumns="False" FlowDirection="RightToLeft"
                             ElementExporting="radGridView1_ElementExporting" ShowColumnFooters="True" ShowGroupFooters="True" AutoExpandGroups="True"
                             ShowInsertRow="False" SelectionMode="Extended" ActionOnLostFocus="None">
            <telerik:RadGridView.Columns>
                                                               ...
            </telerik:RadGridView.Columns>
        </telerik:RadGridView>

        <Button Height="50" HorizontalAlignment="Left" Margin="68,0,0,12" x:Name="btnDelete" VerticalAlignment="Bottom" Width="50" Click="btnDelete_Click" Command="telerikGrid:RadGridViewCommands.Delete" CommandTarget="{Binding ElementName=RadGridView1}"/>

and this is the code-behind it:

public partial class myProgram : Page
    {
        KDBEntitiesSecond DBContext = new KDBEntitiesSecond();

        public myProgram()
        {            
            InitializeComponent();

            var queryGrid = from c in DBContext.TblLeads select c;
            radGridView1.ItemsSource = queryGrid;

        }

        private void btnDelete_Click(object sender, RoutedEventArgs e)
        {            
            DBContext.SaveChanges();
        }
    }

Thanks in advance!

[Vanya Pavlova]

Hello Aiden,

 
The button is disabled, because you have to initialize the command before the InitializeComponent() within MainWindow.xaml.cs:

        public Example()
{
              ICommand deleteCommand = RadGridViewCommands.Delete;
      InitializeComponent();
         }

You may read more about commands in our online documentation, please follow this link.
In addition to this you may also refer to our online demos as well. 

Kind regards,
Vanya Pavlova
the Telerik team

[Aiden]

Hello Vanya,

I just doing what you noticed about initializing the command, and still doesn't make any difference!
Is there any other reason for this kind of problems?

Regards,

[Vanya Pavlova]

Hi Aiden,

The button uses the built-in Delete command, which removes the SelectedItem/SelectedItems in RadGridView. Since you have intitialized  the command in code-behind and when you select an item (or multiple items) in RadGridView this Button will be enabled.  If the behavior is not the same by your side I would recommend you to send this project to us a new support ticket where we can see what might be wrong.  

Greetings,
Vanya Pavlova
the Telerik team

[Kevin]

Aiden,

The problem is that you are binding the RadGridView to an IEnumerable (from c in DBContext.TblLeads select c)
To get the built-in Delete, Insert, etc commands to work you must bind to a modifiable collection like List or ObservableCollection.

Readers should ignore Vanya's August 19, 2011 comment since it is not at all accurate.

Kevin Kalitowski