+my %class_descriptors = (
+ action => { class => 'SL::Layout::ActionBar::Action', num_params => 1, },
+ combobox => { class => 'SL::Layout::ActionBar::ComboBox', num_params => 1, },
+ link => { class => 'SL::Layout::ActionBar::Link', num_params => 1, },
+ separator => { class => 'SL::Layout::ActionBar::Separator', num_params => 0, },
+);