I´m sorry, this is probaly a newbie error, but is not working , i did just like u said.
Code:
[Constructable]
public PlateChest() : base( 0x1415 )
{
Weight = 10.0;
XmlAttach.AttachTo(this, new XmlSocketable(4, SkillName.Tinkering, 100.0, typeof(IronIngot), 100));
}
public PlateChest( Serial serial ) : base( serial )
{
}