+ * @param {String} [ext.tabId] You can provide additional property (`tabId`) if you wish to open the dialog on a specific tabId.\r
+ *\r
+ * // Open the dialog on the 'keystroke' tabId.\r
+ * editor.addCommand( 'keystroke', new CKEDITOR.dialogCommand( 'a11yHelp', { tabId: 'keystroke' } ) );\r