have you tried setting the default value of the choice control to be the first option/tab?
have a look on this - https://community.nintex.com/message/48573-re-open-specific-panel-from-nintex-workflow-url-link?commentID=48573#comment-…
it's about how to take over which tab should be opened by default from URL, but you may customize it to always open the same tab.
Thanks for your reply Marian. In my case I am opening the panel from the workflow.
what do you exactly mean with this?you can not open a page directly from workflow.
do you build a link to be used in notification so that once user clicks on it the form is opened on a specific tab?
if so, then the link provided is exactly what you need
I apologize for the typo. In my case I am not opening the panel from the workflow. I want to open the first tab by default when the users open the item. Currently, it opens the tab where the form is submitted.
didn't a link suggested above give you a clue how to do it?
if you still have some difficulties, can you post how did you implement the TAB control?
is it a choice control?
is it rendered as radios, buttons, or...?
it would help if you posted control's configuration dialog.