[TYPO3] How to access a specific plugin function?

[Matthew Manderson]

Regards!

I am trying to move my user class script into an extension class but now I
can't access my methods/functions.

Any ideas which doc I need to read to figure out how to access a specific
method?

# this inserts the whole class
page.10.subparts.orderForm < plugin.tx_orderFormMM_pi1

# this calls a specific method/function of a user class
page.10.subparts.orderForm.userFunc = user_orderForm->showButtons

# neither of these call my method from the ext?
page.10.subparts.orderForm = plugin.tx_orderFormMM_pi1->showButtons
page.10.subparts.orderForm < plugin.tx_orderFormMM_pi1->showButtons

Thanks!
Matthew