WPF ElementHost in WinForms not receiving mouse clicks

Question

I have a winforms application that I'd like to add a WPF user control to. The issue is when I run the program the WPF user control does not respond to mouse events. I can tab through the control and use the keyboard just fine, but the control does not respond to mouse clicks (the buttons don't even recognize when you hover over them). I have attempted the solution in this SO question but it did not help: WPF WinForms Interop issue with Enable / Disable . Please see the code below.

User Control XAML

User Control CS

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;

namespace WinformsWPF
{
    /// 
    /// Interaction logic for ucNotes.xaml
    /// 
    public partial class ucNotes : UserControl
    {
        List notes;
        List noteColumns;
        public ucNotes()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            notes = new List
            {
                new noteItem{nID = 0, nDate = Convert.ToDateTime("9/5/2012 2:48 PM"), nEmployee = "Gardner, John", nText = "This is a test note"},
                new noteItem{nID = 1, nDate = Convert.ToDateTime("9/5/2012 2:51 PM"), nEmployee = "Gardner, John", nText = "This is another test note.  This test note is very long.  It should cause overlap."}
            };
            noteColumns = new List { "nDate", "nEmployee", "nText" };

            dgNotes.GenerateColumns(noteColumns);
            dgNotes.ItemsSource = notes;

        }

        private void dgNotes_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            noteItem noteInfo = (noteItem)dgNotes.SelectedItem;
            lblDate.Content = noteInfo.nDate;
            lblEmployee.Content = noteInfo.nEmployee;
            txtNotes.Text = noteInfo.nText;
        }

        private void txtNotes_LostFocus(object sender, RoutedEventArgs e)
        {
            ((noteItem)dgNotes.SelectedItem).nText = txtNotes.Text;
            dgNotes.Items.Refresh();
        }

        private void btnAdd_Copy_Click(object sender, RoutedEventArgs e)
        {
            notes.Add(new noteItem { nDate = DateTime.Now, nEmployee = "Gardner, John" });
            dgNotes.SelectedIndex = dgNotes.Items.Count - 1;
            dgNotes.Items.Refresh();
            txtNotes.Focus();
        }
    }
    public static class dataGridExtension
    {
        public static void GenerateColumns(this DataGrid dataGrid, List columns)
        {
            List oldColumns = dataGrid.Columns.ToList();
            dataGrid.Columns.Clear();

            int index = 0;
            foreach (var column in oldColumns)
            {
                var newCol = (DataGridTextColumn)column;
                newCol.Binding = new Binding(columns[index++]);
                dataGrid.Columns.Add(newCol);
            }
        }
    }
    public class noteItem
    {
        public int nID { set; get; }
        public DateTime nDate { set; get; }
        public string nEmployee { set; get; }
        public string nText { set; get; }
    }
}

The windows form is empty except for the ElementHost (ie, it's a fresh project with nothing changed). Let me know if you would like that code as well.

Any help would be appreciated.

Colin Smith · Accepted Answer

You inadvertently had IsHitTestVisible="False" set on the UserControl....take that off and it works.

That will stop the control getting mouse messages when hit.

http://msdn.microsoft.com/en-us/library/system.windows.uielement.ishittestvisible.aspx

WPF ElementHost in WinForms not receiving mouse clicks

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