WP Types plugin | re-position custom fields

I am new user to wp-types plugin and I have a problem with re-positioning the custom fields I have created using the plugin.

for example: if I created a text field and allowed multiple-instances of this field then I created an image field with multiple-instances allowed.

when I add many texts fields and many Images I can re-position them but only replace the position of a text field with another text field and I want to replace the text field with the image field to obtain certain order

Is there anyway to re-position fields independent on its type?

Thanks in advance

via Chebli Mohamed