ENT:Use Loop help

[[FSG] ToXiiC]

So I'm making a entity where when you press it. So when I press E (Use) on it rather than just make one derma panel it makes 3 (If i press E quick) and if I hold E down then it just keeps looping, making a infinite amount of derma panels. Here is the code I'm using, its really basic since Im new to glua.

Code:
Server Side:

function ENT:Use(activator, caller)
	if caller:IsPlayer() then
		net.Start("WD_OpenMenu")
		net.Send(caller)
	end
end

Client Side:

net.Receive("WD_OpenMenu", function()
	local wd_frame = vgui.Create("DFrame")
	wd_frame:SetSize(100,100)
	wd_frame:SetVisible(true)
	wd_frame:Center()
	wd_frame:MakePopup()
	print("I was pressed") // This is just to let me know how many panels its making
end)

[DaWhalee]

self:SetUseType( SIMPLE_USE )

in the initialize function of the entity.