Treeviewcolumn class is needed when creating treeviews. It allows you to specify different attributes for the columns of your treeviews.
Treeviewcolumn class must always be embedded inside a <treeview> declaration.
Its XML tag is <column>. See Treeview class for details.
Note that you cannot create instances of this class using moai.CreateObject(). Treeview column numbers are currently static, i.e. you cannot add or remove columns at runtime.