how to add a new function to core - Joomla! Forum - community, help and support

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hi,
i found function in joomla
   listitemtask
for understand can open item in list if this: listitemtask('cb1','orderdown') order list far good.
i have searched can´t find this:  listitemtask located in script file?
i need creat function "if joomla don´t have , think not" can open record example if this:
open_item('1','from_db_x',order_xpto') open item in x form determine , work components have in joomla great question the  listitemtask creat other function ? , need change , joomla know must return show me item in form want?
thanks lot :)

i don't know mean, might able make mambot (or component?) extend class listitemtask function in want.  sorry can't more specific.





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