/// <summary>
/// Event delegate method fired when the <see cref="AddButton"/> button is clicked.
/// </summary>
/// <param name="sender">Sender object.</param>
/// <param name="e">Event arguments.</param>
private void AddButton_Click(object sender, EventArgs e)
{
Point screenPoint = AddButton.PointToScreen(new Point(AddButton.Left, AddButton.Bottom));
AddButtonContextMenuStrip.Show(AddButton,
screenPoint.Y + AddButtonContextMenuStrip.Size.Height > Screen.PrimaryScreen.WorkingArea.Height
? new Point(0, -AddButtonContextMenuStrip.Size.Height)
: new Point(0, AddButton.Height));
}