ExtJS 3 introduced a 'ref' attribute allowing the code to refer to the child components (nested at any level) of a given component using simple dot notation.
I am trying migrate the ExtJS 3 code that uses this technique to ExtJS 4 and getting errors stating that the child component is not defined. I checked the API documentation and was not able to find any trace of 'ref' attribute.
What happened to it? What is the proper way of referencing child components in ExtJS 4?