How to create in the Interface controller of a component

Hi Gurus............
Could any one tel How to create a method in the interface controller of component
and use that componet into other comoponent as Used Contoller .
I Found following Tutorial but it was not cleared Description.
https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/2e71ce83-0b01-0010-11a4-98c28a33195f
Thanks in Advance.

Hi all,
My actual requirement is as follows..
I have implemented some functionality in One component .
Here I want to create a new method in the interface controller, so that I should be able to access this method in another component by declaring this component as used component in another one.
My problem is, I am unable to create new method in interface controller of my component,
It is appearing i n 'disabled' mode.
Can any one please suggest me the appropriate solution?
Thanks in advance
SivaKumar

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