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private void button1_MouseDown(object sender, MouseEventArgs e)
{
ContextMenuStrip p = new ContextMenuStrip();
p.Items.Add("aaa");
ToolStripMenuItem b = p.Items.Add("bbb") as ToolStripMenuItem;
b.DropDownItems.Add("ccc");
b.DropDownItems.Add("ccc");
b.DropDownItems.Add("ccc");
b.DropDownItems.Add("ccc");
if (e.Button == MouseButtons.Left)
p.Show(button1.PointToScreen(e.Location));
}