WPF

<Window>
  <Grid>
    <CustomTextBox />
    <CustomTextBox />
    <Label />
    <Label />
  </Grid>
</Window>

<Window>
  <Window.Resources>
    <XmlDataProvider x:Key="configdata"/>
    <XmlDataProvider x:Key="servodata"/>
  </Window.Resources>
  <Grid>
    <TabControl>
      <TabItem>
        <Grid>
        <ScrollViewer>
          <TabControl ItemsSource="{Binding Source={StaticResource configdata}, XPath=PROGRAM/CONFIG_PAGE}">
              <TabControl.ItemTemplate>
                <DataTemplate>
                  <TextBlock Text="{Binding XPath=@page_title}"/>
                </DataTemplate>
              </TabControl.ItemTemplate>
              <TabControl.ContentTemplate>
                <DataTemplate>
                  <toolkit:DataGrid ItemsSource="{Binding XPath=DATA}">
                    <toolkit:DataGrid.Columns>
                      <toolkit:DataGridTextColumn Binding="{Binding XPath=DESCRIPTION}"/>
                      <toolkit:DataGridTextColumn Binding="{Binding XPath=VALUE}"/>
                    </toolkit:DataGrid.Columns>
                  </toolkit:DataGrid>
                </DataTemplate>
              </TabControl.ContentTemplate>
            </TabControl>
          </ScrollViewer>
        </Grid>
      </TabItem>
      <TabItem>
        <Grid>
          <TabControl>
            <TabItem>
              <Grid>
                <toolkit:DataGrid ItemsSource="{Binding Source={StaticResource configdata}, XPath=IO/Inputs/Input}">
                  <toolkit:DataGrid.Columns>
                    <toolkit:DataGridTextColumn Binding="{Binding XPath=DESCRIPTION}"/>
                    <toolkit:DataGridTextColumn Binding="{Binding XPath=VALUE}"/>
                    <toolkit:DataGridTextColumn Binding="{Binding XPath=METRIC_VALUE}"/>
                  </toolkit:DataGrid.Columns>
                </toolkit:DataGrid>
              </Grid>
            </TabItem>
            <TabItem>
              <Grid>
                <toolkit:DataGrid ItemsSource="{Binding Source={StaticResource configdata}, XPath=IO/Outputs/Output}">
                  <toolkit:DataGrid.Columns>
                    <toolkit:DataGridTextColumn Binding="{Binding XPath=DESCRIPTION}"/>
                    <toolkit:DataGridTextColumn Binding="{Binding XPath=VALUE}"/>
                    <toolkit:DataGridTextColumn Binding="{Binding XPath=METRIC_VALUE}"/>
                  </toolkit:DataGrid.Columns>
                </toolkit:DataGrid>
              </Grid>
            </TabItem>
          </TabControl>
        </Grid>
      </TabItem>
      <TabItem>
    	<Grid>
          <toolkit:DataGrid ItemsSource="{Binding Source={StaticResource servodata}, XPath=DATA}">
            <toolkit:DataGrid.Columns>
              <toolkit:DataGridTextColumn Binding="{Binding XPath=DESCRIPTION}"/>
              <toolkit:DataGridTextColumn Binding="{Binding XPath=VALUE}"/>
              <toolkit:DataGridTextColumn Binding="{Binding XPath=METRIC_VALUE}"/>
            </toolkit:DataGrid.Columns>
          </toolkit:DataGrid>
        </Grid>
      </TabItem>
    </TabControl>
    <Button/>
    <Button />
  </Grid>
</Window>

Why explicit Style defined in a theme Which had been applied for one control aren't  update when change the Theme ?.

Main.xaml: (This is a resume of main.xaml , to see full have a look the attached file)

<UserControl>
    <Grid x:Name="LayoutRoot" Background="White" >
        <!--[PROBLEM]: This Border Style doesn't refresh when the Theme changed-->
        <Border Style="{StaticResource BorderStyle2}">
            <Button Click="Change_to_Dark_Click"
                        Height="20">Select Dark Theme</Button>
        </Border>
    </Grid>
</UserControl>


Main.xaml.cs : (This is a resume of main.xaml.cs, to see full have a look the attached file)
       private void Change_to_Dark_Click(object sender, RoutedEventArgs e)
        {
            //Cleannig
            App.Current.Resources.Clear();
            App.Current.Resources.MergedDictionaries.Clear();
            Theme.SetApplicationThemeUri(App.Current, null);

            Uri themeUri = new Uri("/Controls.Dark;component/Generic.xaml", UriKind.RelativeOrAbsolute);
            Theme.SetApplicationThemeUri(Application.Current, themeUri);
        //The theme changed but the style of Border doesn't change.
    }

There is a Controls project "Controls.csproj" (to see full have a look the attached file) with:
Generic.xaml
Style.xaml
ButtonCustomized.xaml

There are 2 themes projects  created like this "Controls.Dark.csproj" (to see full have a look the attached file):
Generic.xaml
Style.xaml

Generic.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:controls="clr-namespace:Controls;assembly=Controls">
    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="/Controls.Dark;component/Style.xaml" />
        <ResourceDictionary Source="/Controls;component/Themes/ButtonCustomized.xaml" />
    </ResourceDictionary.MergedDictionaries>

</ResourceDictionary>

Style.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Color x:Key="KeyColor">#FDB800</Color>
    <Color x:Key="KeyColor2">#FBD8AB</Color>
    <SolidColorBrush x:Key="KeyColorBrush"
                     Color="{StaticResource KeyColor}" />
    <SolidColorBrush x:Key="KeyColorBrush2"
                     Color="{StaticResource KeyColor2}" />

    <Style x:Key="BorderStyle1"
           TargetType="Border">
        <Setter Property="Background"
                Value="{StaticResource KeyColorBrush}" />
    </Style>

    <Style x:Key="BorderStyle2"
           TargetType="Border">
        <Setter Property="Background"
                Value="{StaticResource KeyColorBrush2}" />
    </Style>
</ResourceDictionary>

I don't know why the explicit style doesn't are updates when change theme of the application?

Thanks for the future answers, regards.

Attached file in 

Could not load type 'System.Windows.Controls.VirtualizingPanel' from assembly 'System.Windows, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e'.