Getting Widgets in a panel is a nice way to interact with widgets you make. You can add several widgets into a panel, and get all of them by looping through the widgets in the panel. I make a specific panel to put all my reminder widgets in. Then I gather data and use it elsewhere.

/**
* get my reminders
* @return ReminderData
*/
private ReminderData[] getReminderData() {

//count my reminders i have in the verticalpanel pReminder
int count = pReminder.getWidgetCount();

//I use ReminderData object to transport my data around
ReminderData[] reminderData = new ReminderData[count];

//loop through my ReminderWidget(s) in the pReminderPanel
for (int i=0; i < count; i++) {

//cast the widget to my ReminderWidget
ReminderWidget rw = (ReminderWidget) pReminder.getWidget(i);

//I use a method to gather up the values in the reminder Widget
reminderData[i] = rw.getReminderData();
}

//then I return the values to the next object, and then to rpc
return reminderData;
}