Effect zoom in panel with component

I have a form with an panel A and a trackbar. Inside panel A, i have a second panel B, and inside that panel B there are many textbox. I need that when moving the trackbar, it decreases panel B with all the textbox that are included in it.
I need that when moving the trackbar I increase the size of panel B, and all the components in it. As a Zoom effect.
I try change font size of form, but it did not work.
I use Visual Studio for it.

private void trackBarMap_Scroll(object sender, EventArgs e)
        {
            float font = 14;
            float scroll = trackBarMapa.Value;
            float fontfinal = (font * scroll) / 100;
            panelB.Font = new Font("Microsoft Sans Serif", fontfinal);

            panelB.Height = (height * Convert.ToInt32(scroll)) / 100;
            panelB.Width = (width * Convert.ToInt32(scroll)) / 100;

            panelB.Refresh();
        }