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Data trigger not working with dynamically created date picker

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DatePicker
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akjoshi
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akjoshi asked on 19 Dec 2008, 05:10 PM

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> 

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Miroslav
Telerik team
answered on 23 Dec 2008, 02:48 PM
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
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akjoshi
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answered on 24 Dec 2008, 12:13 PM
Hi Miroslav,

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

Merry Xmas :)
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Miroslav
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akjoshi
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