public void verifyText(VerifyEvent event) {
			 
			    // Assume we don't allow it
				event.doit = false;
			 
			    // Get the character typed
			    char myChar = event.character;
			    String text = ((Text) event.widget).getText();
			 
			 // Allow 0-9
			   if (Character.isDigit(myChar)) event.doit = true;
			 
			   // Allow backspace
			  if (myChar == '\b') {
			  event.doit = true;
			  	
			    }
			 }