MessageBox.alert OK onclick?

[hornetnz]

Is it possible to attach a function to the onclick of the OK button in a MessageBox.alert window? I need to have it re-open the MessageBox that it just replaced.

if (e.exists) {
            Ext.MessageBox.alert('Create new array', 'That array already exists. Please provide a unique name.');
        } else {
            this.fireEvent('create', this, { Name: workflowName, ArrayName: workflowName });
            this.setActiveRecord(null);
        }

[hornetnz]

Of course I managed to overlook the callback part in the doc. Never mind!