WPF

public static class UIElementEnablerExtension
{
    public static string GetSecurityKey(DependencyObject obj)
    {
        return (string)obj.GetValue(SecurityKeyProperty);
    }

    public static void SetSecurityKey(DependencyObject obj, string value)
    {
        obj.SetValue(SecurityKeyProperty, value);
    }

    public static readonly DependencyProperty SecurityKeyProperty =
        DependencyProperty.RegisterAttached(
            "SecurityKey", typeof(string), typeof(UIElementEnablerExtension),
            new UIPropertyMetadata("", OnSecurityKeyPropertyChanged));

    private static void OnSecurityKeyPropertyChanged(DependencyObject d,DependencyPropertyChangedEventArgs e)
    {
        // If the current user has been set
        if (AppCore.CurrentUser != null)                   // AppCore is a static class
        {
            // Get the new value set in the XAML
            var accessKey = (string)e.NewValue;

            // If the key was set in the XAML...
            if (!string.IsNullOrEmpty(accessKey))
            {
                // Get the element
                var element = (UIElement)d;

                // Check the user to see if the access code is there
                var hasAccess = AppCore.CurrentUser.Rights.Any(x => x.CompareTo(accessKey) == 0);

                // Enable/Disable the element accordingly
                element.IsEnabled = hasAccess;
            }
        }
    }
}

<Button Content="Can Do Something"
        Command="{Binding MyCommand"}
        cls:UIElementEnablerExtension.SecurityKey="canUpdate"/>

<menubtn:DropDownButton Grid.Column="2"
                        x:Name="btnAddItem" 
                        ToolTip="New Item"
                        Margin="2">

<pre>
<Image Height="32"
        Width="32" 
        Source="/Jayhawk.UI.WPF;component/Media/Images/new.png"/>

<menubtn:DropDownButton.Menu>
    <ContextMenu>

        <MenuItem x:Name="newCompanyButton" 
                    Command="{Binding NewItemCommand}"
                    CommandParameter="{Binding RelativeSource={RelativeSource Self}}"
                    Tag="company"
                    Header="New Company" />

        <MenuItem x:Name="newProjectButton" 
                    Command="{Binding NewItemCommand}"
                    CommandParameter="{Binding RelativeSource={RelativeSource Self}}"
                    Tag="project"
                    Header="New Project" />

        <MenuItem x:Name="newEmployeeButton" 
                    Command="{Binding NewItemCommand}"
                    CommandParameter="{Binding RelativeSource={RelativeSource Self}}"
                    Tag="employee"
                    Header="New Employee" />

    </ContextMenu>
</menubtn:DropDownButton.Menu>

public class DropDownButton : ToggleButton
{
    public DropDownButton()
    {
        // Bind the ToogleButton.IsChecked property to the drop-down's IsOpen property 
        Binding binding = new Binding("Menu.IsOpen");
        binding.Source = this;
        this.SetBinding(IsCheckedProperty, binding);
        DataContextChanged += (sender, args) =>
        {
            if (Menu != null)
                Menu.DataContext = DataContext;
        };
    }

    public ContextMenu Menu
    {
        get { return (ContextMenu)GetValue(MenuProperty); }
        set { SetValue(MenuProperty, value); }
    }
    public static readonly DependencyProperty MenuProperty = DependencyProperty.Register("Menu", typeof(ContextMenu), typeof(DropDownButton), new UIPropertyMetadata(null, OnMenuChanged));

    private static void OnMenuChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var dropDownButton = (DropDownButton)d;
        var contextMenu = (ContextMenu)e.NewValue;
        contextMenu.DataContext = dropDownButton.DataContext;
    }

    protected override void OnClick()
    {
        if (Menu != null)
        {
            // If there is a drop-down assigned to this button, then position and display it 
            Menu.PlacementTarget = this;
            Menu.Placement = PlacementMode.Bottom;
            Menu.IsOpen = true;
        }
    }
}

private ICommand _NewItemCommand;
public ICommand NewItemCommand
{
    get
    {
        if (_NewItemCommand == null)
            _NewItemCommand = new RelayCommand<object>(p => NewItemExecuted(p), p => NewItemCanExecute());
        return _NewItemCommand;
    }
}

private bool NewItemCanExecute()
{
    bool canExecute = true;

    if (SelectedTabView != null)
    {
        switch (SelectedTabView.ItemType)
        {
            case NavigationItemType.Employee:
                canExecute = AppCore.AppSecurity.HasAccess("add_employees");
                break;

            default:
                break;
        }
    }

    return canExecute;
}

In wpf mvvm, a checkbox is set in a custom popup. If there is another datagrid below the popup control, clicking the checkbox will pass the mouse click event to the lower layer. How to control the mouse click event in the custom popup at the upper layer, so that the click event is not passed to the bottom layer, thank you

<DataGridTextColumn Header="PO Cost" 
                    Binding="{Binding Total, StringFormat=C, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                    Width="100"
                    IsReadOnly="True">

<pre>
<DataGridTextColumn.HeaderStyle>
    <Style TargetType="DataGridColumnHeader">
        <Setter Property="HorizontalContentAlignment" Value="Right" />
    </Style>
</DataGridTextColumn.HeaderStyle>

<DataGridTextColumn.ElementStyle>
    <Style TargetType="{x:Type TextBlock}">
        <Setter Property="HorizontalAlignment" Value="Right" />
    </Style>
</DataGridTextColumn.ElementStyle>

Width="{Binding SystemParameters.PrimaryScreenWidth}">