Вопрос как закруглить интерфейс на lua vgui

на пример как тут

 

Панель, на которой отображеныы варианты для выбора окрашена в чёрный с помощью функции панели Paint и функции "рисовки" draw.RoundBox

PANEL:Paint

Called whenever the panel should be drawn. You can create panels with a customized appearance by overriding their Paint() function, which will prevent the default appearance from being drawn. Render operations from the surface (and consequentially the draw) are always offset by the global...

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draw.RoundedBox

Draws a rounded rectangle. If you do not define a cornerRadius, surface. DrawRect will be used instead for performance. This is a rendering function that requires a 2d rendering context. This means that it will only work in 2d Rendering Hooks.

wiki.facepunch.com

local frame = vgui.Create("DFrame")
frame:MakePopup()
frame:SetSize(400, 200)
frame:Center()

function frame:Paint(w,h)
    draw.RoundedBox(0,0,w,h,Color(20,20,20))
end

писал по памяти