Vietpad.NET.Controls.ToolStripRadioButtonMenuItem.OnCheckedChanged C# (CSharp) Method

        protected override void OnCheckedChanged(EventArgs e)
        {
            base.OnCheckedChanged(e);

            // If this item is no longer in the checked state, do nothing.
            if (!Checked) return;

            // Clear the checked state for all siblings. 
            foreach (ToolStripItem item in Parent.Items)
            {
                ToolStripRadioButtonMenuItem radioItem =
                    item as ToolStripRadioButtonMenuItem;
                if (radioItem != null && radioItem != this && radioItem.Checked)
                {
                    radioItem.Checked = false;

                    // Only one item can be selected at a time, 
                    // so there is no need to continue.
                    return;
                }
            }
        }