public DimmerMask(Form parent)
{
//InitializeComponent();
this.FormBorderStyle = FormBorderStyle.None;
this.BackColor = Color.Black;
this.Opacity = 0.70;
this.ShowInTaskbar = false;
this.StartPosition = FormStartPosition.Manual;
this.Size = parent.ClientSize;
this.Location = parent.PointToScreen(Point.Empty);
parent.Move += AdjustPosition;
parent.SizeChanged += AdjustPosition;
}