public Panel AddTab(string title)
{
var tab = _header.AddTab(title);
tab.OnSelect += TabOnSelect;
var panel = new Panel(Id + "_panel", ((Widget)this).Width, ((Widget)this).Height - _tabHeaderHeight)
{
Y = _tabHeaderHeight,
IgnoreInput = true,
CanHaveInputFocus = false
};
Add(panel);
_tabPanels.Add(panel);
Gui.SetVisible(panel, _tabPanels.Count == 1);
return(panel);
}