How to call method in web dynpro for ABAP

Hi All,
I created a z class and two methods to get the data.
I created a WE4A application. Now i want to call these methods from my Z calss in the web dynpro ,but i am getting  amessage saying 'type zclass is unknown".
when i am trying to declare
data: cl_class type ref to zclass . i am getting above message.
can anyone explain how to call zcalss methods in my application.

Hi,
You can call any global class method in WDA via. Wizard.
Even more you can make your class as assistance class and call their methods by wd_assist.
Thanks
Pradeep

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