A panel item is a control (or widget) that can be placed on a panel to accept user input, and display information.
The following functions apply to panel items, which include button, checkbox, choice, message, text, multi-line text, slider.
panel-item-get-command-event
panel-item-get-label
panel-item-set-default
panel-item-set-label
long ( panel-item-get-command-event)
Returns the identifier of the command event for the current panel item or menu callback, or zero if not called within a callback.
string ( panel-item-get-label long panel-id)
Get the item's label.
long ( panel-item-set-default long panel-id)
Make this item the default.
long ( panel-item-set-label long panel-id string label)
Set the item's label.