DivTall
Sets a panel's height to a fraction of its parent's height.
Arguments
(Optional) Number frac
What fraction to set the panel's height to
(Optional) Panel target
The panel we should follow, if not its parent
Example
local pnl = vgui.Create("DPanel")
pnl:DivTall(4) -- Sets the panel to 1/4th the height of its parent