Set GridViewComboBoxColumn ItemsSource on Got Focus

[Ivano]

Hi

I trying to set GridViewComboBoxColumn itemsSource when GotFocus event is fired but it doesn't work.
I ' m using Q2 2010 SP1 libraries and I put

this.AddHandler(RadComboBox.GotFocusEvent, new RoutedEventHandler(comboGotFocus));

in the control constructor while the handler is

void comboGotFocus(object sender, RoutedEventArgs args)
{
    GridViewCell cell = args.OriginalSource as GridViewCell;
    if (cell != null && cell.Column.UniqueName == "RegionId")
    {
        District district = cell.DataContext as District;
        if (district != null && cell.Content is LookupElement)
        {
            string countryId = district.CountryId;
            RadGridView gridView = (RadGridView)this.districtRegistryControl.ChildrenOfType<RadGridView>().First();
            RadComboBox comboBox = (cell.Content as LookupElement).ComboBox;
            if (comboBox != null)
            {
                comboBox.ItemsSource = null;
                if (string.IsNullOrEmpty(countryId) == false)
                    comboBox.ItemsSource = from r in iGasContext.Context.Regions
                                           where r.CountryId == countryId
                                           select r;
                else
                    comboBox.ItemsSource = iGasContext.Context.Regions;
            }
        }
    }
}

Thanks
Ivano

[Maya]

Hi Ivano,

Please share more details about your exact requirements and the scenario you want to accomplish. Thus I will be able to provide you with an appropriate solution and a sample project if needed.
 

All the best,
Maya
the Telerik team

[Ivano]

Hi

my need is to fiter GridViewComboBoxColumn items based on another row value (in the example above I have to filter available regions on the selected country); the issue has already been discussed in the forum and there's a proposal in a blog too; but the solution do not suite my needs because I'm using ADO.NET Entity Framework 4.0 and data model is autogenerated and updated by VisualStudio (the proposed solution uses ItemsSourceBinding an ad hoc property of Location class).
So I've tried to manage cell GotFocus event and filter cell ComboBox myself; but filter is never applied and combo box is always empty.
I've prepared a sample project; is there a way to upload it?

Sincerely
Ivano

[Maya]

Hello Ivano,

All you need to do is to add a partial class and define the property responsible for the filling up the source of the ComboBox. You may follow up the example in this blog post. In the sample project attached in that article, the correct property is AvailableCountries. As for the handling of the lookup values and their implementation, you may read more here.

Kind regards,
Maya
the Telerik team

[Ivano]

Hi

thanks very much; I'd forgotten that Entity framework classes are partials.

Sincerely
Ivano