Data trigger not working with dynamically created date picker

[akjoshi]

I am creating a date picker in my code and want to change its background whenever its value is not valid(specified by IsValidFieldValue flag), but its not working .

Here is my code for creating the control and style :

// Binding to be set for control

Binding binding = new Binding("Value");

binding.Mode = BindingMode.TwoWay;

binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;

string datePickerXamlTemplate = "<telerik:RadDatePicker x:Name=\"uxDatePickerCustomField{0}\" Grid.Row=\"1\" Grid.Column=\"1\" Height=\"24\" HorizontalAlignment=\"Left\" Margin=\"8,5,8,5\" Width=\"125\" xmlns=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation\" xmlns:telerik=\"clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Input\" xmlns:x=\"http://schemas.microsoft.com/winfx/2006/xaml\" />";

string datePickerXaml = string.Format(datePickerXamlTemplate, field.Id, count);

stream = new MemoryStream(ASCIIEncoding.Default.GetBytes(datePickerXaml));

RadDatePicker datePicker = (RadDatePicker)System.Windows.Markup.XamlReader.Load(stream);

datePicker.SetBinding(RadDatePicker.SelectedDateProperty, binding);

datePicker.Style = (Style)FindResource("DatePickerStyle");

datePicker.DataContext = field; // Object having properties - Value and IsValidFieldValue. Implements INotifyPropertyChanged

uxGrid.Children.Add(datePicker); // Added to a Grid

    <UserControl.Resources>
        <Style TargetType="{x:Type telerikInput:RadDatePicker}" x:Key="DatePickerStyle">
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=IsValidFieldValue, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" Value="false">
                    <Setter Property="telerikInput:RadDatePicker.Background" Value="#FFFFB9B9" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </UserControl.Resources>

[Miroslav]

Hello Abhishek,

There was a bug in the ControlTemplate of the DatePicker that means that the Background was not applied.

This will be fixed in the next ServicePack. I am attaching a project where I have included a fixed ControlTemplate in the App.xaml resources. You use this style until the release.

I am sorry if this has been an issue for you.
 
Thanks for your feedback!

All the best,
Miroslav
the Telerik team

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[akjoshi]

Hi Miroslav,

Thanks for the solution, will try this and let you know the result.

Merry Xmas :)