Why dosnt ShowInTaskBar = true not work in C#

Question

I've been looking around and cant seem to find any of the help I need for my program I need it so when I click a specific button(F9) It hides the program from taskbar. After its hidden from taskbar I need to be able to click a button(F10) to make it Show in task bar again. Currently when I run it F9 Hides it but F10 wont show it

        private void Menu_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.F9)
            {
                SecHiden.PerformClick();
            }
            if (e.KeyCode == Keys.F10)
            {
                SecShow.PerformClick();
            }
        }

        private void SecHiden_Click(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Minimized;
            this.ShowInTaskbar = false;
        }

        private void SecShow_Click(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Normal;
            this.ShowInTaskbar = true;
        }   
    }
}

EDIT: i've figured out the error just need help fixing it I have to be tabbed into the program for the Keybinds to work is there a way to fix this? I would like to able to use the keybinds when im on Any specift tab(F10 Wouldnt show the tab because I wasnt tabbed onto the program to make the keybind work)