How to use method of Standard Class

Hi all,
I want to call a pop up in pcui screen in some standard application with some text. I have made Zclass of standard SAP class which i am using (cl_bsp_accmod_contact in CRM system).
I think i have to call 'PRINT_STRING' method of standard class CL_BSP_ELEMENT.
I am trying to use this code: 

data: lr_data type ref to cl_bsp_element.
concatenate html 'rohit' into html. (html is a string)
lr_data->print_string( html ).
but it gives a dump:
You attempted to use a 'NULL' object reference (points to 'noth
access a component (variable: "lr_data").
An object reference must point to an object (an instance of a class)
before it can be used to access components.
I dont know how to assign object reference to an object???
Plz help me in this regard,
Thanks in advance,
Rohit

Hi ,
try and use :
data: lr_data type ref to cl_bsp_element.
concatenate html 'rohit' into html. (html is a string)
lr_data->print_string( html = html ).
You are creating a variable...but not passing the value to the parameter...it is exactly like callin get_data or get_cell_value...!!
Hope this helps.
Do reward each useful answer.
Thanks,
Tatvagna.

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