Why does my popup not respond to touches? [duplicate] - wpf

Question

This question already has answers here:
SurfaceScrollViewer: getting touch on nested children
(2 answers)
Closed 2 years ago.
I have been banging my head on this for a while now! Here is my simple User Control:
<UserControl x:Class="DaCapo.MyUserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:s="http://schemas.microsoft.com/surface/2008"
IsManipulationEnabled="True"
Width="300" Height="300">
<Canvas>
<s:SurfaceButton x:Name="button" Width="100" Height="100" Content="Click!" Style="{x:Null}"/>
<Popup x:Name="popup" Width="200" Height="100" IsOpen="False" StaysOpen="True" PlacementRectangle="0,0,200,100"
AllowsTransparency="True" Focusable="True">
<DockPanel x:Name="dockpanel" Width="200" Height="100" Background="SteelBlue" Focusable="True"/>
</Popup>
</Canvas>
</UserControl>
I want to be able to detect touches on the DockPanel or in a possible child of it. Here follows the code behind for the same class, with the alternatives I attempted:
public partial class MyUserControl : UserControl
{
public MyUserControl()
{
InitializeComponent();
TouchExtensions.AddHoldGestureHandler(this.button, this.HoldHandler);
/* NONE OF THE FOLLOWING WORKS */
// TouchExtensions.AddTapGestureHandler(this.popup, this.TapHandler);
// this.dockpanel.TouchDown += new System.EventHandler<TouchEventArgs>(popup_TouchDown);
// this.popup.TouchDown += new System.EventHandler<TouchEventArgs>(popup_TouchDown);
// this.popup.ManipulationStarting += new System.EventHandler<ManipulationStartingEventArgs>(popup_ManipulationStarting);
// this.dockpanel.ManipulationStarting += new System.EventHandler<ManipulationStartingEventArgs>(popup_ManipulationStarting);
}
void popup_ManipulationStarting(object sender, ManipulationStartingEventArgs e) { Debug.WriteLine("Tap..."); }
void popup_TouchDown(object sender, TouchEventArgs e) { Debug.WriteLine("Tap..."); }
private void TapHandler(object sender, TouchEventArgs e) { Debug.WriteLine("Tap..."); }
private void HoldHandler(object sender, TouchEventArgs e) { Debug.WriteLine("Holding..."); this.popup.IsOpen = true; }
}
I do believe I am missing something obvious. Can someone please help me? Thanks.

Answer 1

The Button & popup needs to be connected to its click (or touch) handlers defined in the code behind, in XAML itself.
If you want to handle touch events for the dockpanel, How about
adding a button inside the dockpanel with opacity = 0 ??
EDIT :
I can see that you defined a few handlers, but did you add those Handlers to the button?
For example, for a SurfaceButton :
IN XAML :
<s:SurfaceButton Click="OpenButton_Click"/>
Correspondingly connects the function in C# as:
private void OpenButton_Click(object sender, RoutedEventArgs e)
{
// Handle the action for the click here.
}

Answer 2

Under the covers, Popup creates another hwnd to render its content into. This is different from all other WPF controls. You need to register this hwnd with the Surface SDK so it will start sending touch events to it. Use this to do that: http://msdn.microsoft.com/en-us/library/microsoft.surface.presentation.input.touchextensions.enablesurfaceinput.aspx