I'm using the InputManager to check if changes to controls are done by user or code. This works fine, except when user uses the context menu for cut/copy/paste. If the user do ctrl+v in a textbox, InputManager correctly notices it. However, if the paste is done from the context menu of the textbox, the InputManager never fires the PreNotifyInput or PostNotifyInput events. Anyone knows why? Or how to detect that these user actions? Below is a working sample. The lower textblock never gets updated when user uses the cut/copy/paste menu in the above textbox since PreNotifyInput never fires.

XAML:

<Window x:Class="InputMgrDemo.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Height="300" Width="300">
    <StackPanel>
        <TextBox TextChanged="TextBox_TextChanged" />
        <TextBlock Name="_text" />
    </StackPanel>
</Window>

Code behind:

using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

namespace InputMgrDemo
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();

            InputManager.Current.PreNotifyInput += ((sender, e) => _userInput = true);
            InputManager.Current.PostNotifyInput += ((sender, args) => _userInput = false);
        }

        private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            if (_userInput)
            {
                _text.Text = (sender as TextBox).Text;
            }
        }

        private bool _userInput;
    }
}