You don't actually have anything in that scroll control. If you wanted to add a control to it, you would do
PHP Code:
new GuiScrollCtrl("blah")
{
//vars
new GuiTextCtrl("blah2")
{
//vars
}
}
Currently you just have a control over it.
Why not add a way to easily add items to be sold? Make an inventory system? So far it's just an empty gui control.