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Auto/default selection in GLM

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Hi all,

I need to pre select an item in a list.

Consider the following snipped, how do I tell

the list the default selected item is, let say, Array?

I could not find an example and tried different ways

using transmissions with no luck

| browser |

browser := GLMTabulator new.

browser

title: 'test';

column: #classes;

initialExtent: 200@300.

browser transmit

to: #classes;

andShow: [ :pres |

pres tree

display: [ OrderedCollection with: Collection ];

children: [ :each | each subclasses];

allExpanded;

format: [ :each | each name ]] .

browser openOn: Collection

TIA

Arturo