This question has been answered by Bruno17. See the first response.
&docid=`ID`
&docid=`[[+id]]`

Array
(
[MIGX_id] => 1
[MIGX_formname] => Default Package
[image] => assets/images/specials/agr-summer-special.png
[title] => fgdhdfgh
[description] => dfgh
[_alt] => 0
[_first] => 1
[_last] => 1
[idx] => 1
[property.tvname] => tab-content-info
[property.tpl] =>
[property.docid] => 14
)
[[!getResources? &parents=`[[*id]]` &tpl=`tab-contentTpl` &limit=`10` &includeTVs=`1` &processTVs=`1` &sortby=`menuindex` &sortdir=`ASC` ]]
<div id="[[+alias]]">
[[!getImageList? &tvname=`tab-content-info` &tpl=`` &docid=`[[+id]]`]]
</div>
you are missing the tpl-property.
It is outputting the fields as array, if you don't have a tpl defined.
&tpl=`@FIELD:MIGX_formname`
http://rtfm.modx.com/display/ADDON/MIGX.Varying+layout-boxes#MIGX.Varyinglayout-boxes-TheTemplate
&tpl=`@FIELD:MIGX_formname`
Thank you!!!