Mainframe. java import java. awt\.\*; import javax. swing\.\*; public class mainframe extends jframe { controlpanel control; public mainframe() { super("lab 08 starter"); maclayoutsetup(); control = new controlpanel(); (control, "center"); setdefaultcloseoperation(exit_on_cl ose); setsize(1200, 600); setvisible(true); } public void maclayoutsetup() { // on some macs it might be necessary to have the statement below //for the background color of the button to appear try { uimanager. setlookandfeel(uimanager.; } catch (exception e) { e. printstacktrace(); } } }