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how to find the TLB of a widget

Is there a simple way (other than recursively getting the parent)
to find the Top-level base of a widget.  I don't have an event
structure to query (which stores it as one of it's fields).

It seems that it should be obtainable in one fell swoop using
widget_info or widget_control, but I can't seem to find
it if it is there.

Shall I bother to write the routine get_tlb (OK, I've already
written as it is so trivial)  or does such already exist.