Making a texture hidden and not hidden if...

[ZunaSW]

Hi. Sorry my english : )
I'm not sure how to do this, I know it can be done, but I'm not sure if I'm going well or I'm doing it wrong. Here is what I want to do:

My texture will be always hidden, but when the stamina is below 10% the texture will be shown. This is how I put the texture:

-- Barra de Aguante
  local wm = GetWindowManager()
  local c = wm:CreateTopLevelWindow(nil)
  c:SetDimensions(1024,128)
  c:SetAnchor(BOTTOM,GuiRoot,BOTTOM,0,0)
  --Textura de la barra de aguante
  c.icon = wm:CreateControl(nil, c, CT_TEXTURE)
  c.icon:SetTexture("Addon/tex/tex1.dds")
  c.icon:SetAnchorFill(c)

I used this "tutorial" and now I can understand how to put textures: http://www.esoui.com/downloads/info33-zTextureTest.html But not how to "call" them to do something later. I'm not sure if I'm explaining well what I want to say. In some moment you will have to "call" your texture to be shown, for example in Papyrus of Skyrim (I'll put a example similar of what I want to do in the Addon):

Event OnCellLoad()
	MyNPC.enable()
EndEvent

That "MyNPC" is "called" in a property. And I'm trying to find something like that, I know you can't do it because this is not the Creation Kit and this is all write and write and write codes, but it has to be a way to call that texture, and then it will become possible to shown or not shown. I tried with this:

local function SHStaminaBar()
-- Barra de Aguante
	local wm = GetWindowManager()
	local c = wm:CreateTopLevelWindow(nil)
	local staminabar = SHStamina(WINDOW_MANAGER:CreateTopLevelWindow("stamina") )
		 staminabar:SetHidden(true)
		 staminabar:SetDimensions(1024,128)
                 staminabar:SetAnchor(BOTTOMRIGHT,GuiRoot,BOTTOMRIGHT,0,0)
		 staminabar:SetTexture("Addon/tex/tex1.dds")
		 staminabar:SetAnchorFill(c)
		 staminabar:SetAlpha(1.0)
		if (ZO_PlayerAttributeStamina < 10)
			staminabar:SetHidden(false)
		end	 
 return window
end

But no way, it's giving me an error for that "staminabar:SetHidden(false)".
How to do this?

Thanks!