C#

private void Form1_MouseClick(object sender, MouseEventArgs e)
{

    if (e.Button == MouseButtons.Right)
    {
        panel1.ContextMenu.Show(panel1, new Point(e.X, e.Y));
    }
}

private const int WM_NCHITTEST = 0x84;
private const int HT_CLIENT = 0x1;
private const int HT_CAPTION = 0x2;

protected override void WndProc(ref Message m)
{
    base.WndProc(ref m);

    if (m.Msg == WM_NCHITTEST && m.Result.ToInt32() == HT_CLIENT)
    {
        m.Result = (IntPtr)HT_CAPTION;
    }

}

protected override CreateParams CreateParams
{
    get
    {
        int WS_DLGFRAME = 0x00400000;
        CreateParams parameters = base.CreateParams;
        parameters.Style = parameters.Style & ~WS_DLGFRAME;
        return parameters;
    }
}

namespace WindowControlTest
{
    public partial class WindowMain : Form
    {
        public WindowMain()
        {
            InitializeComponent();

            int iPlayers = 4;
            UserControl uctlPlayerPane = new UserControl();

            switch (iPlayers)
            {
                case 2:
                    uctlPlayerPane = new uctl_2Player();
                    break;

                case 3:
                    uctlPlayerPane = new uctl_3Player();
                    break;

                case 4:
                    uctlPlayerPane = new uctl_2Team();
                    break;

                case 6:
                    uctlPlayerPane = new uctl_2Player();
                    break;

            }
            uctlPlayerPane.Location = new Point(25, 25);
            this.Controls.Add(uctlPlayerPane);
        }
    }
}