A two-state check box.

scheduler.locale.labels.section_checkme = "I'm going to participate";   
 
scheduler.config.lightbox.sections = [
    { name:"text", height:50, map_to:"text", type:"textarea", focus:true },
    { name:"checkme", map_to:"participation", type:"checkbox", 
    checked_value: "registrable", unchecked_value: "unchecked", height:40 },
    { name:"time", height:72, type:"time", map_to:"auto"}
];
Related sample: Checkbox in the lightbox
To add the Checkbox control to the lightbox, follow these steps:
scheduler.plugins({
    editors: true
});
scheduler.config.lightbox.sections = [
    { name:"description", ... },
    { name:"checkme", map_to:"single_checkbox", type:"checkbox", 
    checked_value: "registrable", height:40},
    { name:"time", ...}
];
scheduler.locale.labels.section_checkme = "I'm going to participate";
Related sample: Checkbox in the lightbox
The following properties are mostly important and commonly set for the 'checkbox' control (see the full list here):
| name | (string) the section's name | 
| height | (number) the section's height | 
| map_to | (string) the name of a data property that will be mapped to the section | 
| type | (textarea,time,select,template,multiselect,radio,checkbox,combo) the type of the section's control | 
| checked_value | (boolean) the value of the checkbox in the checked state. Optional. By default, true | 
| unchecked_value | (boolean) the value of the checkbox in the unchecked state. Optional. By default, false |