Opens a dialog corresponding to the trigger.
Kind: instance method of [DialogFacet](#DialogFacet)
See: dialog.open
| Param | Type | Description |
|---|---|---|
| dialog | ? |
The dialog definition, as a JSON-encoded string. |
| triggerId | ? |
The trigger that this dialog opens in response to. |
| [optCb] | function |
Optional callback, if not using promises. |
