Hi Esteban, As an entry point, you have PluggableTextFieldMorph. You can build one with UITheme class >> newTextEntryIn: aThemedMorph for: aModel get: getSel set: setSel class: aClass getEnabled: enabledSel help: helpText see the 'class:' argument. As an example, if you pass Integer, then a specific converter is used so that you can only enter a valid integer. AFAIK, so far we have converters for String and Number. To implement new converters (to and from Date as an example), dig into PluggableTextFieldMorph>>convertTo: aClass    "Set the converter object class."    self converter isNil        ifTrue: [self converter: (ObjectStringConverter forClass: aClass)]        ifFalse: [self converter objectClass: aClass] and indeed, it would be could to integrate new converters. See SetingDeclaration>>inputWidgetForString as an client example. Cheers Alain