ok... it is more complicated than I thought... this is what I dug for now (sorry, this is large): 1) the fix proposed originaly is still necesary. 2) GLMBrowser>>unregisterFromAllAnnouncements needs to be defined this way: unregisterFromAllAnnouncements super unregisterFromAllAnnouncements. self panes do: [:each | each presentations unregisterFromAllAnnouncements ]. self transmissions do: [ :each | each destination pane unregisterFromAllAnnouncements ] (this include panes in transmissions in the clean up) 3) this is the ugly part: there is an identity problem, because GLMUpdateActions are being copied a lot of times, to ensure the browser function. And unsubscribe: checks for identical objects (==) to remove from the annoncements. So... and THIS IS NOT THE SOLUTION, just a validation of the problem. I did: a) I added a method to Announcer: Announcer>>unsubscribeNonIdentical: anObject subscriptions ifNil: [ ^ self ]. subscriptions keysAndValuesDo: [ :class :actions | subscriptions at: class put: (actions reject: [ :each | each receiver = anObject ]) ]. subscriptions keysAndValuesRemove: [ :class :actions | actions isEmpty ] (it just changes the check by == to a check by =) b) assign an unique id, = and hash to GLMUpdateAction: id ^id ifNil: [ id = UUID new asString ] = other self species = other species ifFalse: [ ^false ]. ^self id = other id hash ^self species hash bitXor: self id hash c) modify GLMUpdateAction>>unregisterFromAllAnnouncements self announcerObjects do: [:each | each unsubscribeNonIdentical: self ] and with all this changes... announcement un-suscription is working :P this is the test who validates it: GLMUpdateAction>>testUnregisterAnnouncementsWhenUpdatingPane | announcer browser presentation | announcer := Announcer new. browser := GLMTabulator new. browser row: #one. browser transmit to: #one; andShow: [ :presenter | (presentation := presenter list) updateOn: TestAnnouncement from: [ announcer ]; display: [ :start | start to: 10 ] ]. browser startOn: 1. presentation registerAnnouncements. browser unregisterFromAllAnnouncements. self assert: (announcer instVarNamed: 'subscriptions') isEmpty. So... this makes the un-suscription works, but the whole "id" thing is really-really ugly. So, as I don't know much of Glamour, maybe you can say me a real fix for this :) Cheers, Esteban pd: I attached all this as a comment on issue http://code.google.com/p/moose-technology/issues/detail?id=492 El 15/01/2011, a las 10:43a.m., Tudor Girba escribió:

Thanks a lot! Doru On 15 Jan 2011, at 14:45, Esteban Lorenzano wrote: -- www.tudorgirba.com "Not knowing how to do something is not an argument for how it cannot be done."