Hi,   The 'minimize' tool button (documentation): @cfg {Boolean} minimizable True to display the 'minimize' tool button and allow the user to minimize the window, false to hide the button and disallow minimizing the window. Note that this button provides no implementation -- the behavior of minimizing a window is implementation-specific, so the minimize event must be handled and a custom minimize behavior implemented for this option to be useful.   The 'maximize' tool button: I couldn't r