private void btnLaunchDialog_Click(object sender, EventArgs e)
        {
            //workaround
            RadForm1 f = new RadForm1();
            f.StartPosition = FormStartPosition.Manual;
            int x = this.Location.X + this.Size.Width / 2 - f.Size.Width / 2;
            int y = this.Location.Y + this.Size.Height / 2 - f.Size.Height / 2;
            f.DesktopLocation = new Point(x, y);
            f.Shown += F_Shown;
            f.Opacity = 0;
            f.ShowDialog();
        }

        private void F_Shown(object sender, EventArgs e)
        {
            RadForm f = sender as RadForm; 
            int x = this.Location.X + this.Size.Width / 2 - f.Size.Width / 2;
            int y = this.Location.Y + this.Size.Height / 2 - f.Size.Height / 2;
            f.DesktopLocation = new Point(x, y);
            f.Opacity = 1;
        }