Hi, I'm trying to display buttons only if a condition is true on the same window, making the condition is easy but I can get the conditional to run again when a change is done so it displays the row with the buttons, here is the code: open | builder content | builder := UITheme builder. content := builder newColumn: {(builder newRow: {(builder newButtonFor: self action: #listaPrestamos label: 'Prestamos' help: 'Listar Prestamos'). (builder newButtonFor: self action: #listaMateriales label: 'Material' help: 'Listar Material'). (builder newButtonFor: self action: #listaSocios label: 'Socios' help: 'Listar Socios'). (builder newButtonFor: self action: #listaEjemplares label: 'Ejemplares' help: 'Lista de Ejemplares')}). (builder newColumn: {((PluggableMultiColumnListMorph on: self list: #listado selected: #seleccionado changeSelected: #seleccionado: menu: nil wrapSelector: #wrap:at:) extent: 600@600)})}. #listado = Prestamo database ifTrue: [builder newRow: {(builder newButtonFor: self action: #addPrestamo getEnabled: nil label: 'Nuevo Prestamo' help: 'Ingresar nuevo prestamo'). (builder newButtonFor: self action: #devPrestamo getEnabled: #selecciono label: 'Devolver' help: 'Devolver'). (builder newButtonFor: self action: #addEjemplar label: 'Agregar Ejemplar' help: 'Ingresar nuevo ejemplar'). (builder newButtonFor: self action: #addMaterial label: 'Agregar Material' help: 'Ingresar nuevo material'). (builder newButtonFor: self action: #addSocio label: 'Nuevo Socio' help: 'Ingresar nuevo socio'). (builder newButtonFor: self action: #remover getEnabled: #selecciono label: 'Remover' help: 'Ingresar nuevo prestamo'). (builder newButtonFor: self action: #guardar label: 'guardar' help: 'Ingresar nuevo socio')}] ifFalse: (Transcript show: 'Flase'; cr). (content openInWindowLabeled: 'Babel') extent: 600 @ 600. self changed: #listado; changed: #open.