Change contentpane of Frame after button clicked

Question

I want to be able to set a JFrame\'s contentpane after a button inside one of that frame\'s JPanels has been clicked.

My architecture consists of a controller which

Answer 1

Whenever you change a frame's containment hierarchy, you have to call pack().

From the docs:

Causes this Window to be sized to fit the preferred size and layouts of its subcomponents. [...] The Window will be validated after the preferredSize is calculated.