LinedCorners

Lines the top left and bottom right corners of the panel.

Arguments

(Optional) Color col Color of the lines

(Optional) Number len Length of each line

Example

local pnl = vgui.Create("DButton")
pnl:ClearPaint()
    :Background(Color(54, 92, 111, 255))
    :LinedCorners()

Looks something like this (credit Richard's Arivia F4 Menu):