GridViewLoadingIndicator's background can't change when I set ApplicationTheme programmatically.

[Yonghan]

Hi.
I want set the background to transparent of GridViewLoadingIndicator.
But it doesn't work when I set ApplicationTheme programmatically.
And I made a sample based on 265667_SilverlightApplication162.zip sample code from the forum.

How do I set transarent background busy indicator with Office_Silver theme?
I want to chanage just busyIndicator's background.

Regards,
Yonghan Yoon

public App()
        {
            StyleManager.ApplicationTheme = new Office_SilverTheme();
             InitializeComponent();

            // Create a WebContext and add it to the ApplicationLifetimeObjects collection.
            // This will then be available as WebContext.Current.
            WebContext webContext = new WebContext();
            webContext.Authentication = new FormsAuthentication();
            //webContext.Authentication = new WindowsAuthentication();
            this.ApplicationLifetimeObjects.Add(webContext);
        }

<telerik:RadWindow.Resources>
    <LinearGradientBrush x:Key="GridView_LoadingIndicatorBackground" EndPoint="0.5,1" StartPoint="0.5,0">
        <GradientStop Color="#FFCBDFF4"/>
        <GradientStop Color="#FF557AA5" Offset="0.5"/>
        <GradientStop Offset="1" Color="White"/>
    </LinearGradientBrush>
    <SolidColorBrush x:Key="GridView_LoadingIndicatorBorder" Color="#995384BF" />
    <ControlTemplate x:Key="GridViewLoadingIndicatorTemplate" TargetType="telerik:GridViewLoadingIndicator">
        <Border x:Name="BusyIndicatorBackground" Background="Transparent">
            <VisualStateManager.VisualStateGroups>
                <VisualStateGroup x:Name="CommonStates">
                    <VisualState x:Name="Idle"/>
                    <VisualState x:Name="Loading">
                        <Storyboard RepeatBehavior="Forever">
                            <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[2].(RotateTransform.Angle)" Storyboard.TargetName="BusyIndicator">
                                <SplineDoubleKeyFrame KeyTime="00:00:01" Value="180"/>
                            </DoubleAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                </VisualStateGroup>
            </VisualStateManager.VisualStateGroups>
            <Path x:Name="BusyIndicator" Data="M18,5.0000002 C10.820298,5 5,10.820298 5.0000002,18 5,25.179701 10.820298,31 18,31 25.179701,31 31,25.179701 31,18 31,10.820298 25.179701,5 18,5.0000002 z M18,0 C27.941126,0 36,8.0588746 36,18 36,27.941126 27.941126,36 18,36 8.0588746,36 0,27.941126 0,18 0,8.0588746 8.0588746,0 18,0 z" Fill="{TemplateBinding Background}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Height="36" Margin="{TemplateBinding Padding}" RenderTransformOrigin="0.5,0.5" Stretch="Fill" Stroke="{TemplateBinding BorderBrush}" StrokeThickness="{TemplateBinding BorderThickness}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Width="36">
                <Path.RenderTransform>
                    <TransformGroup>
                        <ScaleTransform/>
                        <SkewTransform/>
                        <RotateTransform Angle="-180"/>
                        <TranslateTransform/>
                    </TransformGroup>
                </Path.RenderTransform>
            </Path>
        </Border>
    </ControlTemplate>
    <Style TargetType="telerik:GridViewLoadingIndicator">
        <Setter Property="Template" Value="{StaticResource GridViewLoadingIndicatorTemplate}"/>
        <Setter Property="Background" Value="{StaticResource GridView_LoadingIndicatorBackground}"/>
        <Setter Property="BorderBrush" Value="{StaticResource GridView_LoadingIndicatorBorder}"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="Padding" Value="0"/>
        <Setter Property="VerticalContentAlignment" Value="Center"/>
        <Setter Property="HorizontalContentAlignment" Value="Center"/>
    </Style>
</telerik:RadWindow.Resources>

<Grid x:Name="LayoutRoot" Background="White" DataContext="{Binding Source={StaticResource SampleDataSource}}">
    <telerik:RadGridView ItemsSource="{Binding Collection}" IsBusy="True"/>
</Grid>

[Vanya Pavlova]

Hi Yonghan,

 

Indeed each style is theme specific. Once you set the application theme, your custom style is being overriden.
However in this very specific case I believe that the best option is to use one of the approaches below:

                                                      "Modifying built-in theme"
                            "Creating a Custom Theme Project - Using the Telerik Approach"


Please let me know if you need any further assistance. 

Greetings,
Vanya Pavlova
the Telerik team