Creates a GBPanel and adds it to the specified position, with the specified
width and height, and connects the panel to this panel's frame, dialog, or applet
for event handling with buttons and list boxes.
A DoubleField is a component that allows the editing of a double (floating-point number),
and allows the user to avoid messy conversions to and from strings.
An IntegerField is a component that allows the editing of an integer (whole number),
and allows the user to avoid messy conversions to and from strings.