Brew MP 1.0.2
This function is used to execute a function on a container and some or all of
its children. This is similar to the broadcast functionality but allows more
control and flexibility. The client passes in a callback function, function context
and a depth value, and then the container widget performs a preorder traversal of
its containment tree. Each widget is visited in turn, starting with the top-level
container that is the target for this function.
Pointer to the IWidget interface object.
Callback function to execute on each widget in container hierarchy
Context pointer for callback function
Number of levels to descend. (Use zero to descend into all levels).