Hi Doru and all, Your recently announced dynamic features of Glamour might be handy for a browser I am trying to build. My example code below contains a couple of buttons. When clicked, a list or tree should appear, and be populated (with the contents of the selection from user), below the button. Please evaluate the following code: | browser | browser := GLMTabulator new. browser column: [: a | a row: #inputdata; row: #dictionary; row: #territories ]; column: [: a | a row: [ :r | r column: #start; column: #end ] span: 10; row: #info span: 3; row: #actions ] span: 6. browser transmit to: #inputdata; andShow: [ : a | a title: 'Input Data'. a actionList act: [: entity | (UIManager default chooseDirectory: 'Select directory' from: FileSystem root) ifNotNilDo: [: dir | self halt ] ] entitled: 'Load...' ]. browser transmit to: #dictionary; andShow: [ : a | a list title: 'Data Dictionary' ]. browser transmit to: #territories; andShow: [ : a | a title: 'Territory Data'. a actionList act: [: entity | (UIManager default chooseFileMatching: #('*.txt') label: 'Choose a TXT') ifNotNilDo: [: file | self halt ] ] entitled: 'Load...']. browser transmit to: #info; andShow: [:a | a text display: [ : x | 'Select input data' ]; title: 'Log' ]. browser title: 'My Browser'; openOn: (1 to: 10). It seems I have two issues here: - How to tell Glamour: "Create a list below this button". - How to populate the list with new contents Do you have any suggestions? Cheers, Hernán