Hi joko.pitoyo,
If you want a min/max button on the window itself, like the “collapse” button in this demo:
http://www.jqwidgets.com/jquery-widgets-demo/demos/jqxwindow/defaultfunctionality.htm?light , you can’t have it, because it’s not possible to add one there. However you can add a simple “resize” button like in the example I’ve provided and enable/disable the resizing abbility of the window. If enabled you can change the size of the window anyway you want to by just pulling from any of the corners of the widget.
Best Regards,
Christopher
jQWidgets Team
http://www.jqwidgets.com