请大家指点一下 sas/af 中的submit 命令运用

想调用submit 命令，在output窗口中执行打印数据的操作，程序如下

init:    

pushbutton1:  /* 在af的frame中，设计好一个按钮*pushbutton1 */                                                                                                                             

submit;                                                                                                                                
data a;                                                                                                                                
set sashelp.class;                                                                                                                     
run;                                                                                                                                    
proc print data=a;                                                                                                                     
run;                                                                                                                                   
endsubmit;                                                                                                                              
                                                                                                                   
return;                                                                                                                                 
              
执行pushbutton1后（程序调试并无错误）但是在output窗口中并无打印结果，请大家指点，谢谢。