private void styleButton_Click(object sender, EventArgs e)
        {
            MetroColorStyle?style = AppearanceManager.ConvertStyleToColor(((Button)sender).BackColor);

            if (style != null)
            {
                AppearanceManager.SetStyleOnForms(style.Value, this, _shellForm);

                AppearanceManager.SaveSettings(_shellForm.BaseMetroStyleManager);
            }
        }