GUI...

[#Paper]

The GUI don't show:

function showSkinSelect() 
local skins = { 7,8...} 
SelectSkinBtn = guiCreateButton(45,517,368,124,"Select skin!",false) 
guiSetFont(SelectSkinBtn,"default-bold-small") 
SkinGridList = guiCreateGridList(46,176,367,321,false) 
Skinidcolumn = guiGridListAddColumn(SkinGridList,"Skin ID",0.2) 
for k, v in ipairs(skins) do 
SkinIdRow = guiGridListAddRow ( SkinGridList ) 
guiGridListSetItemText ( SkinGridList, SkinIdRow, Skinidcolumn, v, false, false ) 
end 
dxDrawText("Select your skin!",314.0,6.0,812.0,142.0,tocolor(255,0,0,255),2.0,"bankgothic","center","center",false,false,false) 
end 
addEventHandler("onClientPlayerJoin", getRootElement(), showSkinSelect) 

[MatXpl]

https://wiki.multitheftauto.com/wiki/GuiSetVisible ?

[Dark Dragon]

onClientPlayerJoin

This event is triggered when a player joins a server. It is triggered for all players except the local player, as the local player joins the server before their client-side resources are started.

try onClientResourceStart instead

[Castillo]

drawing functions requires onClientRender to run.