Bullets in RichTextBox

Apologies if this is confusing but I am very confused with my logic in making this function.

Basically I have a button in a menu strip for making a bulleted list. If this is checked true I want bullets to be displayed (if not no bullets).

I have started with the following code:

        private void bulletsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (bulletsToolStripMenuItem.Checked == false)
            {
                bulletsToolStripMenuItem.Checked = true;
                txtMain.SelectionBullet = true;
            }
        }

My thinking behind this is if there are not bullets & the button is clicked they need to be displayed.  This works fine to display the bullets & check the item. I have then added:

else
                bulletsToolStripMenuItem.Checked = false;
                txtMain.SelectionBullet = false;

Which in my logic should do the opposite. But this checks & unchecks the item but doesn't display the bullets.

My whole method is:

private void bulletsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (bulletsToolStripMenuItem.Checked == false)
            {
                bulletsToolStripMenuItem.Checked = true;
                txtMain.SelectionBullet = true;
            }
            else
                bulletsToolStripMenuItem.Checked = false;
                txtMain.SelectionBullet = false;
        }

Any help with where I am going would be greatly appreciated. Thanks in advance & again sorry for the length.