I have problems when updating my tabbed panels :'(

After modifying the data on one panel I update several other panels, that are not necessarily connected together.

Using only #update e.g. (browser paneNamed: #example) update.

The data is correctly updated, but not the presentations.

Based on the example #updateableBrowser I am showing the errors.

1) #when in the second list does not react.

* If you start with an empty collection, the list does not appear, then if you add an element the list does not appear neither.

* if you start with some elements, the list is there, but after removing all the elements the list does not disappear, and instead you have a SubscriptOutOfBounds error because of a tab index (this is my same scenario: tabbed panels)

2) #shouldValidate: what is the logic of this?.

I tried to use it, but i got into problems on the selected item. I could only inspect the selected item of the panel using #shouldValidate. In the second panel -> selected item is nil or the value of the first panel.

| browser collection |

collection := GLMAnnouncingCollection new.

collection add: 1.

browser := GLMTabulator new.

browser column: #automatic; column: #menu.

browser act: [:b | b entity add: (b entity size + 1) ] entitled: 'Add an item in the collection'.

browser act: [:b | b entity removeLast ] entitled: 'Remove last item from the collection'.

browser act: [:b | b update ] entitled: 'Update complete browser'.

browser transmit to: #automatic; andShow: [ :a |

a title: 'Updated automatically'.

a stackedArrangement.

a list title: [:x | 'List: ', x size printString ];

shouldValidate: true;

updateOn: GLMItemAdded from: #yourself;

updateOn: GLMItemRemoved from: #yourself ].

browser transmit to: #menu; andShow: [ :a |

a title: 'Updated via menu'.

a list title: 'List';

when:[ :e| e size > 0 ];

act: [:p | p update ] entitled: 'Update'.

a text title: 'Text'; act: [:p | p update] entitled: 'Update'. ].

browser openOn: collection