Help with DllImport and Canvas

[Gintaras]

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// script ""
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Media;

var b = new wpfBuilder("Window").WinSize(500);
var dialog1 = new WpfDialogInWindow(b.Window);
b.R.Add("Text", out TextBox text1).Focus();
b.R.AddButton("Show dialog", _ => _ShowDialogInWindow()).Margin("70");
b.R.AddOkCancel();
b.End();
if (!b.ShowDialog()) return;

void _ShowDialogInWindow() {
    if (dialog1.Content == null) { //show the same content created once. Or you can set new/different content each time.
        var b = new wpfBuilder(panelType: WBPanelType.Canvas).Size(120, 120); //the Canvas
        b.Add<Label>("Dialog");
        b.AddButton("Cancel", _ => dialog1.Show(false)).XY(25, 80, 70, 20);
        b.End();
        dialog1.Content = b.Panel;
        dialog1.ClickToHide = true;
        //dialog1.Dialog.BorderBrush = Brushes.Orange;
        //dialog1.Dialog.BorderThickness = new(2);
        //dialog1.Dialog.Background = Brushes.LightYellow;
    }
    dialog1.Show(true);
}

/// <summary>
/// Shows a dialog-like content in the center of a WPF window.
/// </summary>
/// <example>
/// <code><![CDATA[
/// using System.Windows;
/// using System.Windows.Controls;
/// using System.Windows.Controls.Primitives;
/// using System.Windows.Input;
/// using System.Windows.Media;
///
/// var b = new wpfBuilder("Window").WinSize(500);
/// var dialog1 = new WpfDialogInWindow(b.Window);
/// b.R.Add("Text", out TextBox text1).Focus();
/// b.R.AddButton("Show dialog", _ => _ShowDialogInWindow()).Margin("70");
/// b.R.AddOkCancel();
/// b.End();
/// if (!b.ShowDialog()) return;
///
/// void _ShowDialogInWindow() {
///     if (dialog1.Content == null) { //show the same content created once. Or you can set new/different content each time.
///         var b = new wpfBuilder().Width(200);
///         b.R.Add<Label>("Dialog");
///         b.R.AddButton("Cancel", _ => dialog1.Show(false));
///         b.End();
///         dialog1.Content = b.Panel;
///         dialog1.ClickToHide = true;
///     }
///     dialog1.Show(true);
/// }
/// ]]></code>
/// </example>
class WpfDialogInWindow {
    wpfBuilder _b;
    Window _window;
    Grid _grid;
    FrameworkElement _winContent;
    Border _border;
    Border _dim;
    
    /// <summary>
    /// Initializes this object.
    /// </summary>
    /// <param name="w">A WPF window.</param>
    /// <exception cref="InvalidOperationException">w.Content is not set.</exception>
    /// <remarks>
    /// Replaces <i>w</i> content with a panel where adds <i>w</i> content and a hidden <b>Border</b> control (<see cref="Dialog"/>) that will display user-defined content (<see cref="Content"/>) when <see cref="Show"/> called.
    /// </remarks>
    public WpfDialogInWindow(Window w) {
        _window = w;
        _winContent = w.Content as FrameworkElement ?? throw new InvalidOperationException("w.Content is not set");
        w.Content = null;
        _b = new(w);
        _grid = _b.Panel as Grid;
        _grid.Margin = default;
        _b.Columns(-1, 0, -1);
        _b.Row(-1).Add(_winContent).Span(3).SpanRows(3);
        
        _dim = new() { Background = Brushes.Black, Opacity = .6, Visibility = Visibility.Hidden };
        Grid.SetColumnSpan(_dim, 3); Grid.SetRowSpan(_dim, 3);
        _grid.Children.Add(_dim);
        _dim.MouseLeftButtonDown += (_, _) => { if(ClickToHide) Show(false); };
        
        _b.R.Skip().Add(out _border).Span(1).Hidden().Border(padding: new(5), cornerRadius: 5).Brush(Brushes.White);
        _b.Row(-1);
        _b.End();
    }
    
    /// <summary>
    /// Gets the dialog content container control. You can set its properties, eg background color.
    /// </summary>
    public Border Dialog => _border;
    
    /// <summary>
    /// Sets or gets dialog content.
    /// </summary>
    public FrameworkElement Content { get; set; }
    
    /// <summary>
    /// true if the dialog is visible.
    /// </summary>
    public bool IsVisible => _border.IsVisible;
    
    /// <summary>
    /// Hide the dialog when the user clicks the dimmed area.
    /// </summary>
    public bool ClickToHide { get; set; }
    
    /// <summary>
    /// Shows or hides the dialog.
    /// </summary>
    /// <param name="show"></param>
    public void Show(bool show) {
        if (show == IsVisible) return;
        _border.Child = show ? Content : null;
        _border.Visibility = show ? Visibility.Visible : Visibility.Hidden;
        _dim.Visibility = show ? Visibility.Visible : Visibility.Hidden;
        _winContent.IsEnabled = !show;
    }
}