Could not able to fire events to StackPanel in ScrollViewer

Question

Could not able to fire events to StackPanel which is inside the ScrollViewer.

we tried with Panel.ZIndex but no luck.

 

Greatly appreciated for help.

 

Window1.xaml file

 

<ScrollViewer Name="xxScrollBar" Panel.ZIndex="0" >

<StackPanel PreviewMouseDown="StackPanel_PreviewMouseDown" Panel.ZIndex="1000" MouseDown="StackPanel_MouseDown">

<Slider x:Name="UpperSlider"

Minimum="{Binding ElementName=root, Path=Minimum}"

Maximum="{Binding ElementName=root, Path=Maximum}"

Value="{Binding ElementName=root, Path=UpperValue, Mode=TwoWay}"

Margin="0,15,0,0" />

<Button x:Name="button1" Content="Button" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75"/>

</StackPanel>

</ScrollViewer>

 

Window1.xaml.cs file

 

private void xxScrollBar_PreviewMouseDown(object sender, MouseButtonEventArgs e)

{

if (e.Source.GetType() == typeof(StackPanel))

{

}

}

private void StackPanel_PreviewMouseDown(object sender, MouseButtonEventArgs e)

{

MessageBox.Show("Clicked on StackPanel");

}

private void StackPanel_MouseDown(object sender, MouseButtonEventArgs e)

{

MessageBox.Show("Clicked on StackPanel");

}