DatePicker is not shown correctly in search form

1. in Studio, configure a search form using a label wide enough to push the field to the right part of the form
2. sync the project with the server
3. click the Search form
4. click the date picker
5. observe part of it is not shown, being behind the right part (see datePickerIsBehind.png)

Expected behavior: the date picker should be displayed on top
Note: maybe the z-index should be adjusted?