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private void timer1_Tick(object sender, EventArgs e)
        {
            textBox1.SelectionLength = 0;
            _btn_zurück.Focus();

        }                    

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this.textBox1.GotFocus += new System.EventHandler(this.timer1_Tick);                    

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        private void txtbox_Click(object sender, MouseEventArgs e)
        {
            RichTextBox rtb_test = sender as RichTextBox;
            if (rtb_test != null && rtb_test.Text.Length != 0)
            {
                if (e.Clicks == 1 && rtb_test.Focused)
                {
                    rtb_test.Select(0, 0);
                    this.pan_help.Focus();
                    this.pan_help.AutoScrollPosition = new Point(0,0);
                }
                else
                {
                    this.pan_help.Focus();
                    this.pan_help.AutoScrollPosition = new Point(0, 0);
                }
            }
        }                    

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        private void Mausrad_panel(object sender, MouseEventArgs e)
        {
            if (sender == this.pan_help)
            {
                this.pan_help.VerticalScroll.Value += 1;
                this.pan_help.Refresh();
                this.pan_help.Invalidate();
                this.pan_help.Update();
            }
        }
        private void Mausklick_panel(object sender, MouseEventArgs e)
        {
            if (sender == this.pan_help)
            {
                this.pan_help.Select();
            }
        }