PropertyGrid.PropertyGrid.AddPropertyTab C# (CSharp) Method

        private void AddPropertyTab(PropertyTab tab)
        {
            TabRadioToolButton rtb;
            if (propertyTabs.Count == 0) {
                selectedTab = tab;
                rtb = new TabRadioToolButton (null);
                rtb.Active = true;
                firstTab = rtb;
                toolbar.Insert (new SeparatorToolItem (), FirstTabIndex - 1);
            }
            else
                rtb = new TabRadioToolButton (firstTab);

            //load image from PropertyTab's bitmap
            var icon = tab.GetIcon ();
            if (icon != null)
                rtb.Image = new Gtk.Image (icon);
            else
                rtb.Image = new Gtk.Image (Stock.MissingImage, IconSize.Menu);

            rtb.Tab = tab;
            rtb.TooltipText = tab.TabName;
            rtb.Toggled += new EventHandler (toolbarClick);

            toolbar.Insert (rtb, propertyTabs.Count + FirstTabIndex);

            propertyTabs.Add(tab);
        }