Classe ToolStripDropDownMenu

public Form5()
{
    // Size the form to show three wide menu items.this.Width = 500;
    this.Text = "ToolStripContextMenuStrip: Image and Check Margins";

    // Create a new MenuStrip control.
    MenuStrip ms = new MenuStrip();

    // Create the ToolStripMenuItems for the MenuStrip control.
    ToolStripMenuItem bothMargins = new ToolStripMenuItem("BothMargins");
    ToolStripMenuItem imageMarginOnly = new ToolStripMenuItem("ImageMargin");
    ToolStripMenuItem checkMarginOnly = new ToolStripMenuItem("CheckMargin");
    ToolStripMenuItem noMargins = new ToolStripMenuItem("NoMargins");

    // Customize the DropDowns menus.// This ToolStripMenuItem has an image margin // and a check margin.
    bothMargins.DropDown = CreateCheckImageContextMenuStrip();
    ((ContextMenuStrip)bothMargins.DropDown).ShowImageMargin = true;
    ((ContextMenuStrip)bothMargins.DropDown).ShowCheckMargin = true;

    // This ToolStripMenuItem has only an image margin.
    imageMarginOnly.DropDown = CreateCheckImageContextMenuStrip();
    ((ContextMenuStrip)imageMarginOnly.DropDown).ShowImageMargin = true;
    ((ContextMenuStrip)imageMarginOnly.DropDown).ShowCheckMargin = false;

    // This ToolStripMenuItem has only a check margin.
    checkMarginOnly.DropDown = CreateCheckImageContextMenuStrip();
    ((ContextMenuStrip)checkMarginOnly.DropDown).ShowImageMargin = false;
    ((ContextMenuStrip)checkMarginOnly.DropDown).ShowCheckMargin = true;

    // This ToolStripMenuItem has no image and no check margin.
    noMargins.DropDown = CreateCheckImageContextMenuStrip();
    ((ContextMenuStrip)noMargins.DropDown).ShowImageMargin = false;
    ((ContextMenuStrip)noMargins.DropDown).ShowCheckMargin = false;

    // Populate the MenuStrip control with the ToolStripMenuItems.
    ms.Items.Add(bothMargins);
    ms.Items.Add(imageMarginOnly);
    ms.Items.Add(checkMarginOnly);
    ms.Items.Add(noMargins);

    // Dock the MenuStrip control to the top of the form.
    ms.Dock = DockStyle.Top;

    // Add the MenuStrip control to the controls collection last.// This is important for correct placement in the z-order.this.Controls.Add(ms);
}