Hi,
I hope you mean the Custom Controller the same way we understand as defined here
[http://wiki.sdn.sap.com/wiki/display/WDABAP/Introductiontocontrollers|http://wiki.sdn.sap.com/wiki/display/WDABAP/Introductiontocontrollers]
To access custom controller from the component controller you have to do the following.
1. Component controller->properties->use insert button to select the custom controller.
2. Use the code generator (CTRL+F7) -second tab(general)->method call in used controller->select your custom controller->method.
This will generate code like this
DATA lo_zzsbn_cust_cc1 TYPE REF TO ig_zzsbn_cust_cc1 .
lo_zzsbn_cust_cc1 = wd_this->get_zzsbn_cust_cc1_ctr( ).
lo_zzsbn_cust_cc1->test(
).
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