Java SE (Java Platform, Standard Edition)

I want to create a form that dynamically shows/hides input fields.

For example, I have a RadioButton that will, depending on the value selected, cause a TextArea to be displayed (using a translation & fade transitions). If the radio button has any other controls below it then they will be moved down to make space for the TextArea, if the 'trigger' value in the ToggleGroup of RadioButtons is changed then hide the TextArea (again using transitions) and move any controls up to take the space of the TextArea.

Any help (or examples) will be appreciated.