How do you set positions of child elements in self-made VGUI element?

[igodsewer]

Howdy, recently I've been thinking of most proficient way of setting child elements' positions in such situation:

local PANEL = {}
function PANEL:Init()
    self.closeButton = vgui.Create("DButton")
end

function PANEL:Paint(w, h)
    draw.RoundedBox( 0, w-2, h-2, w, 2, self.bColor or Color(100,200,100, 150))
end

vgui.Register("m_Frame", PANEL, "DFrame")

The way I set [U]self.closeButton[/U]'s position is creating [U]function PANEL:Think()[/U] and setting [U]self.closeButton[/U]'s position in it, but as I think it's one of worst ways doing it so I want to know about other ways doing that :P

Thanks.

[SirRanjid]

function PANEL:Init()
    self.closeButton = vgui.Create("DButton",self) --self = PANEL as parent so derma takes care of repositioning the button every frame
    self.closeButton:SetPos( x, y) --as child these positions are relative to its parent every frame
end

Else I'd take a look into the garrysmod\lua\vgui folder for code examples.