ControlTemplate in WPF —

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

  <ResourceDictionary.MergedDictionaries>

    <ResourceDictionary Source="Shared.xaml" />

  </ResourceDictionary.MergedDictionaries>

  <!-- SimpleStyles: Expander -->

  <ControlTemplate x:Key="ExpanderToggleButton"

                   TargetType="{x:Type ToggleButton}">

    <Border x:Name="Border"

            CornerRadius="2,0,0,0"

            BorderThickness="0,0,1,0">

      <Border.Background>

        <LinearGradientBrush EndPoint="0.5,1"

                             StartPoint="0.5,0">

          <GradientStop Color="{DynamicResource ControlLightColor}" />

          <GradientStop Color="{DynamicResource ControlMediumColor}"

                        Offset="" />

        </LinearGradientBrush>

      </Border.Background>

      <Border.BorderBrush>

        <LinearGradientBrush StartPoint="0,0"

                             EndPoint="0,1">

          <LinearGradientBrush.GradientStops>

            <GradientStopCollection>

              <GradientStop Color="{DynamicResource BorderLightColor}"

                            Offset="0.0" />

              <GradientStop Color="{DynamicResource BorderDarkColor}"

                            Offset="1.0" />

            </GradientStopCollection>

          </LinearGradientBrush.GradientStops>

        </LinearGradientBrush>

      </Border.BorderBrush>

      <VisualStateManager.VisualStateGroups>

        <VisualStateGroup x:Name="CommonStates">

          <VisualState x:Name="Normal" />

          <VisualState x:Name="MouseOver">

            <Storyboard>

              <ColorAnimationUsingKeyFrames Storyboard.TargetName="Border"

                                            Storyboard.TargetProperty="(Panel.Background).

                  (GradientBrush.GradientStops)[].(GradientStop.Color)">

                <EasingColorKeyFrame KeyTime=""

                                     Value="{StaticResource ControlMouseOverColor}" />

              </ColorAnimationUsingKeyFrames>

            </Storyboard>

          </VisualState>

          <VisualState x:Name="Pressed">

            <Storyboard>

              <ColorAnimationUsingKeyFrames Storyboard.TargetName="Border"

                                            Storyboard.TargetProperty="(Panel.Background).

                  (GradientBrush.GradientStops)[].(GradientStop.Color)">

                <EasingColorKeyFrame KeyTime=""

                                     Value="{StaticResource ControlPressedColor}" />

              </ColorAnimationUsingKeyFrames>

            </Storyboard>

          </VisualState>

          <VisualState x:Name="Disabled">

            <Storyboard>

              <ColorAnimationUsingKeyFrames Storyboard.TargetName="Border"

                                            Storyboard.TargetProperty="(Panel.Background).

                  (GradientBrush.GradientStops)[].(GradientStop.Color)">

                <EasingColorKeyFrame KeyTime=""

                                     Value="{StaticResource DisabledControlDarkColor}" />

              </ColorAnimationUsingKeyFrames>

              <ColorAnimationUsingKeyFrames Storyboard.TargetName="Border"

                                            Storyboard.TargetProperty="(Border.BorderBrush).

                  (GradientBrush.GradientStops)[].(GradientStop.Color)">

                <EasingColorKeyFrame KeyTime=""

                                     Value="{StaticResource DisabledBorderLightColor}" />

              </ColorAnimationUsingKeyFrames>

            </Storyboard>

          </VisualState>

        </VisualStateGroup>

        <VisualStateGroup x:Name="CheckStates">

          <VisualState x:Name="Checked">

            <Storyboard>

              <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)"

                                             Storyboard.TargetName="CollapsedArrow">

                <DiscreteObjectKeyFrame KeyTime=""

                                        Value="{x:Static Visibility.Hidden}" />

              </ObjectAnimationUsingKeyFrames>

              <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)"

                                             Storyboard.TargetName="ExpandededArrow">

                <DiscreteObjectKeyFrame KeyTime=""

                                        Value="{x:Static Visibility.Visible}" />

              </ObjectAnimationUsingKeyFrames>

            </Storyboard>

          </VisualState>

          <VisualState x:Name="Unchecked" />

          <VisualState x:Name="Indeterminate" />

        </VisualStateGroup>

      </VisualStateManager.VisualStateGroups>

      <Grid>

        <Path x:Name="CollapsedArrow"

              HorizontalAlignment="Center"

              VerticalAlignment="Center"

              Data="M 0 0 L 4 4 L 8 0 Z">

          <Path.Fill>

            <SolidColorBrush Color="{DynamicResource GlyphColor}" />

          </Path.Fill>

        </Path>

        <Path x:Name="ExpandededArrow"

              HorizontalAlignment="Center"

              VerticalAlignment="Center"

              Visibility="Collapsed"

              Data="M 0 4 L 4 0 L 8 4 Z">

          <Path.Fill>

            <SolidColorBrush Color="{DynamicResource GlyphColor}" />

          </Path.Fill>

        </Path>

      </Grid>

    </Border>

  </ControlTemplate>

  <Style TargetType="{x:Type Expander}">

    <Setter Property="Template">

      <Setter.Value>

        <ControlTemplate TargetType="{x:Type Expander}">

          <Grid>

            <Grid.RowDefinitions>

              <RowDefinition Height="Auto" />

              <RowDefinition x:Name="ContentRow"

                             Height="" />

            </Grid.RowDefinitions>

            <VisualStateManager.VisualStateGroups>

              <VisualStateGroup x:Name="CommonStates">

                <VisualState x:Name="Normal" />

                <VisualState x:Name="MouseOver" />

                <VisualState x:Name="Disabled">

                  <Storyboard>

                    <ColorAnimationUsingKeyFrames Storyboard.TargetName="Border"

                                                  Storyboard.TargetProperty="(Panel.Background).

                        (GradientBrush.GradientStops)[].(GradientStop.Color)">

                      <EasingColorKeyFrame KeyTime=""

                                           Value="{StaticResource DisabledControlDarkColor}" />

                    </ColorAnimationUsingKeyFrames>

                    <ColorAnimationUsingKeyFrames Storyboard.TargetName="Border"

                                                  Storyboard.TargetProperty="(Border.BorderBrush).

                        (GradientBrush.GradientStops)[].(GradientStop.Color)">

                      <EasingColorKeyFrame KeyTime=""

                                           Value="{StaticResource DisabledBorderLightColor}" />

                    </ColorAnimationUsingKeyFrames>

                  </Storyboard>

                </VisualState>

              </VisualStateGroup>

            </VisualStateManager.VisualStateGroups>

            <Border x:Name="Border"

                    Grid.Row=""

                    BorderThickness=""

                    CornerRadius="2,2,0,0">

              <Border.BorderBrush>

                <LinearGradientBrush EndPoint="0,1"

                                     StartPoint="0,0">

                  <GradientStop Color="{DynamicResource BorderLightColor}"

                                Offset="" />

                  <GradientStop Color="{DynamicResource BorderDarkColor}"

                                Offset="" />

                </LinearGradientBrush>

              </Border.BorderBrush>

              <Border.Background>

                <LinearGradientBrush StartPoint="0,0"

                                     EndPoint="0,1">

                  <LinearGradientBrush.GradientStops>

                    <GradientStopCollection>

                      <GradientStop Color="{DynamicResource ControlLightColor}"

                                    Offset="0.0" />

                      <GradientStop Color="{DynamicResource ControlMediumColor}"

                                    Offset="1.0" />

                    </GradientStopCollection>

                  </LinearGradientBrush.GradientStops>

                </LinearGradientBrush>

              </Border.Background>

              <Grid>

                <Grid.ColumnDefinitions>

                  <ColumnDefinition Width="" />

                  <ColumnDefinition Width="*" />

                </Grid.ColumnDefinitions>

                <ToggleButton OverridesDefaultStyle="True"

                              Template="{StaticResource ExpanderToggleButton}"

                              IsChecked="{Binding IsExpanded, Mode=TwoWay,

                    RelativeSource={RelativeSource TemplatedParent}}">

                  <ToggleButton.Background>

                    <LinearGradientBrush EndPoint="0.5,1"

                                         StartPoint="0.5,0">

                      <GradientStop Color="{DynamicResource ControlLightColor}"

                                    Offset="" />

                      <GradientStop Color="{DynamicResource ControlMediumColor}"

                                    Offset="" />

                    </LinearGradientBrush>

                  </ToggleButton.Background>

                </ToggleButton>

                <ContentPresenter Grid.Column=""

                                  Margin=""

                                  ContentSource="Header"

                                  RecognizesAccessKey="True" />

              </Grid>

            </Border>

            <Border x:Name="Content"

                    Grid.Row=""

                    BorderThickness="1,0,1,1"

                    CornerRadius="0,0,2,2">

              <Border.BorderBrush>

                <SolidColorBrush Color="{DynamicResource BorderMediumColor}" />

              </Border.BorderBrush>

              <Border.Background>

                <SolidColorBrush Color="{DynamicResource ContentAreaColorDark}" />

              </Border.Background>

              <ContentPresenter Margin="" />

            </Border>

          </Grid>

          <ControlTemplate.Triggers>

            <Trigger Property="IsExpanded"

                     Value="True">

              <Setter TargetName="ContentRow"

                      Property="Height"

                      Value="{Binding DesiredHeight, ElementName=Content}" />

            </Trigger>

          </ControlTemplate.Triggers>

        </ControlTemplate>

      </Setter.Value>

    </Setter>

  </Style>

</ResourceDictionary>

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