<Window x:Class="BubblePanelTest.MainWindow"  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" <Window.Resources>  <Style TargetType="Label" x:Key="TopBubblePanel">   <Setter Property="Template">    <Setter.Value>     <ControlTemplate TargetType="{x:Type Label}">      <Grid>       <Border CornerRadius="4" BorderBrush="Black" BorderThickness="1" VerticalAlignment="Top" Background="Yellow" HorizontalAlignment="Left" Margin="0,8.5,0,0" Padding="5">        <ContentPresenter />       </Border>       <Canvas Width="10" Height="10" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="10,0,0,0" Background="Transparent">        <Path Stroke="Black" StrokeThickness="0.5" Fill="Yellow">         <Path.Data>          <PathGeometry Figures="M 0,10         L 0,10,5,0         L 5,0,10,10         "/>         </Path.Data>        </Path>       </Canvas>      </Grid>     </ControlTemplate>    </Setter.Value>   </Setter>  </Style>  <Style TargetType="Label" x:Key="BottomBubblePanel">   <Setter Property="Template">    <Setter.Value>     <ControlTemplate TargetType="{x:Type Label}">      <Grid>       <Border CornerRadius="4" BorderBrush="Black" BorderThickness="1" VerticalAlignment="Bottom" Margin="0,0,0,8.5" Background="Yellow" HorizontalAlignment="Left" Padding="5">        <ContentPresenter />       </Border>       <Canvas Width="10" Height="10" HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="10,0,0,0" Background="Transparent">        <Path Stroke="Black" StrokeThickness="0.5" Fill="Yellow">         <Path.Data>          <PathGeometry Figures="M 0,0         L 0,0,5,10         L 5,10,10,0         "/>         </Path.Data>        </Path>       </Canvas>      </Grid>     </ControlTemplate>    </Setter.Value>   </Setter>  </Style>  <Style TargetType="Label" x:Key="LeftBubblePanel">   <Setter Property="Template">    <Setter.Value>     <ControlTemplate TargetType="{x:Type Label}">      <Grid>       <Border CornerRadius="4" BorderBrush="Black" BorderThickness="1" VerticalAlignment="Top" Margin="8.5,0,0,0" Background="Yellow" HorizontalAlignment="Left" Padding="5">        <ContentPresenter />       </Border>       <Canvas Width="10" Height="10" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="0,10,0,0" Background="Transparent">        <Path Stroke="Black" StrokeThickness="0.5" Fill="Yellow">         <Path.Data>          <PathGeometry Figures="M 10,0         L 10,0,0,5         L 0,5,10,10         "/>         </Path.Data>        </Path>       </Canvas>      </Grid>     </ControlTemplate>    </Setter.Value>   </Setter>  </Style>  <Style TargetType="Label" x:Key="RightBubblePanel">   <Setter Property="Template">    <Setter.Value>     <ControlTemplate TargetType="{x:Type Label}">      <Grid HorizontalAlignment="Left">       <Border CornerRadius="4" BorderBrush="Black" BorderThickness="1" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,0,8.5,0" Background="Yellow" Padding="5">        <ContentPresenter />       </Border>       <Canvas Width="10" Height="10" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,10,0,0" Background="Transparent">        <Path Stroke="Black" StrokeThickness="0.5" Fill="Yellow">         <Path.Data>          <PathGeometry Figures="M 0,0         L 0,0,10,5         L 10,5,0,10         "/>         </Path.Data>        </Path>       </Canvas>      </Grid>     </ControlTemplate>    </Setter.Value>   </Setter>  </Style> </Window.Resources> <StackPanel>  <Label Style="{StaticResource TopBubblePanel}" Tag="Top" Margin="2">   <StackPanel>    <StackPanel Orientation="Horizontal">     <TextBlock Text="abc" />     <TextBox Width="80"/>    </StackPanel>   </StackPanel>  </Label>  <Label Style="{StaticResource BottomBubblePanel}" Tag="Top" Margin="2">   <StackPanel>    <StackPanel Orientation="Horizontal">     <TextBlock Text="abc" />     <TextBox Width="80"/>    </StackPanel>   </StackPanel>  </Label>  <Label Style="{StaticResource LeftBubblePanel}" Tag="Top" Margin="2">   <StackPanel>    <StackPanel Orientation="Horizontal">     <TextBlock Text="abc" />     <TextBox Width="80"/>    </StackPanel>   </StackPanel>  </Label>  <Label Style="{StaticResource RightBubblePanel}" Tag="Top" Margin="2">   <StackPanel>    <StackPanel Orientation="Horizontal">     <TextBlock Text="abc" />     <TextBox Width="80"/>    </StackPanel>   </StackPanel>  </Label>  <StackPanel Orientation="Horizontal" Margin="0,30,0,0">   <Button Name="btnTestPopup1" Width="100" Height="30" Content="Bottom" Click="btnTestPopup1_Click" />   <Button Name="btnTestPopup2" Width="100" Height="30" Content="Top" Click="btnTestPopup2_Click" />   <Button Name="btnTestPopup3" Width="100" Height="30" Content="Right" Click="btnTestPopup3_Click" />   <Button Name="btnTestPopup4" Width="100" Height="30" Content="Left" Click="btnTestPopup4_Click" />  </StackPanel>  <Popup Name="pop1" AllowsTransparency="True" StaysOpen="False" PopupAnimation="Slide" PlacementTarget="{Binding ElementName=btnTestPopup1}" Placement="Bottom" >   <Label Style="{StaticResource TopBubblePanel}" Tag="Top">    <StackPanel>     <StackPanel Orientation="Horizontal">      <TextBlock Text="abc" />      <TextBox Width="80" Name="txtTest1" />     </StackPanel>     <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">      <Button Content="確定" Click="btnOK1_Click" Width="50" Height="25" Margin="5" />      <Button Content="取消" Click="btnCancel1_Click" Width="50" Height="25" Margin="5"/>     </StackPanel>    </StackPanel>   </Label>  </Popup>  <Popup Name="pop2" AllowsTransparency="True" StaysOpen="False" PopupAnimation="Fade" PlacementTarget="{Binding ElementName=btnTestPopup2}" Placement="Top" >   <Label Style="{StaticResource BottomBubblePanel}" Tag="Top">    <StackPanel>     <StackPanel Orientation="Horizontal">      <TextBlock Text="abc" />      <TextBox Width="80" Name="txtTest2" />     </StackPanel>     <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">      <Button Content="確定" Click="btnOK2_Click" Width="50" Height="25" Margin="5"/>      <Button Content="取消" Click="btnCancel2_Click" Width="50" Height="25" Margin="5"/>     </StackPanel>    </StackPanel>   </Label>  </Popup>  <Popup Name="pop3" AllowsTransparency="True" StaysOpen="False" PopupAnimation="Scroll" PlacementTarget="{Binding ElementName=btnTestPopup3}" Placement="Right" >   <Label Style="{StaticResource LeftBubblePanel}" Tag="Top">    <StackPanel>     <StackPanel Orientation="Horizontal">      <TextBlock Text="abc" />      <TextBox Width="80" Name="txtTest3" />     </StackPanel>     <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">      <Button Content="確定" Click="btnOK2_Click" Width="50" Height="25" Margin="5"/>      <Button Content="取消" Click="btnCancel3_Click" Width="50" Height="25" Margin="5"/>     </StackPanel>    </StackPanel>   </Label>  </Popup>  <Popup Name="pop4" AllowsTransparency="True" StaysOpen="False" PopupAnimation="None" PlacementTarget="{Binding ElementName=btnTestPopup4}" Placement="Left" >   <Label Style="{StaticResource RightBubblePanel}" Tag="Top">    <StackPanel>     <StackPanel Orientation="Horizontal">      <TextBlock Text="abc" />      <TextBox Width="80" Name="txtTest4" />     </StackPanel>     <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">      <Button Content="確定" Click="btnOK4_Click" Width="50" Height="25" Margin="5"/>      <Button Content="取消" Click="btnCancel4_Click" Width="50" Height="25" Margin="5"/>     </StackPanel>    </StackPanel>   </Label>  </Popup> </StackPanel></Window>

private void btnTestPopup1_Click(object sender, RoutedEventArgs e)  {   pop1.IsOpen = true;  }  private void btnOK1_Click(object sender, RoutedEventArgs e)  {   pop1.IsOpen = false;  }  private void btnCancel1_Click(object sender, RoutedEventArgs e)  {   pop1.IsOpen = false;  }  private void btnTestPopup2_Click(object sender, RoutedEventArgs e)  {   pop2.IsOpen = true;  }  private void btnOK2_Click(object sender, RoutedEventArgs e)  {   pop2.IsOpen = false;  }  private void btnCancel2_Click(object sender, RoutedEventArgs e)  {   pop2.IsOpen = false;  }  private void btnTestPopup3_Click(object sender, RoutedEventArgs e)  {   pop3.IsOpen = true;  }  private void btnOK3_Click(object sender, RoutedEventArgs e)  {   pop3.IsOpen = false;  }  private void btnCancel3_Click(object sender, RoutedEventArgs e)  {   pop3.IsOpen = false;  }  private void btnTestPopup4_Click(object sender, RoutedEventArgs e)  {   pop4.IsOpen = true;  }  private void btnOK4_Click(object sender, RoutedEventArgs e)  {   pop4.IsOpen = false;  }  private void btnCancel4_Click(object sender, RoutedEventArgs e)  {   pop4.IsOpen = false;  }