[Pharo-dev] adding custom tabs to bottom of gtDebugger

[Ben Coman]

With...
    Error subclass: #OwnedLockBadRelease
        instanceVariableNames: 'lockOwner perpetrator'
        classVariableNames: ''
        package: 'Kernel-Processes'

In playground when I do...
    | error |
    (error := OwnedLockBadRelease new) signal
then in the debugger select the 'error' tempvar,
the [Raw] tab is too busy, so I'd like a custom [Error] tab
showing only my two instance variables.

I've managed to get a tab to show up by implementing...
    OwnedLockBadRelease>>gtDebuggerEvaluatorIn: composite
        super gtDebuggerEvaluatorIn: composite.
        (GTObjectVariablesBrowser new evaluatorIn: composite)
        title: 'Error Tab To Do'
but I can't find how to add variables.

Tips please?
cheers -ben