beginGroup method
Begin a named group for subsequent keys.
Group names are converted to upper-case. The default group is
DEFAULT. Nested groups are not supported; calling beginGroup
changes the active group and triggers a flush.
Parameters
groupName: The group name to activate.
Also see:
Implementation
void beginGroup(String groupName) {
objectMethod(pointerId, 'SettingsService', 'beginGroup', args: groupName);
flush();
}