Ngx-formly: Validate a multi-step form with repeatable fieldGroup

[sampow]

I'm submitting a ...

[ ] bug report 
[ ] feature request
[  #x] support request

Current behavior
I use the multi-step form with repeatable fieldGroup in a fieldArray.
What I try to do is validate the form and disable the submit button if the form is invalid or if the fieldArray has no content or the repeatable fieldGroup is not fully completed .
Right now I try to use required equal to true in the fieldArray but with no sucess
I also tried to use the validators but it won't update the whole form

Expected behavior
Be able to get the fieldGroup status (valid or invalid) from the "global" form to enable or disable the next or submit button

Minimal reproduction of the problem with instructions

I've made a stackblitz that reproduce my settings: https://stackblitz.com/edit/angular-kfmshi

How can i validate the form with a repeatable element ?

[aitboudad]

use hideExpression instead of changing hide manually https://stackblitz.com/edit/angular-kfmshi-vcbk6j

[sampow]

@aitboudad , thank you for your quick reply.
Unfortunately I was not clear enough. I updated my stackblitz with your answer.
At step 3 , if you choose no, the button submit remain disabled, How do I track change of status (valid or invalid) from the investments repeat ?

Thank you

[aitboudad]

the investment validators should be placed under repeat field type or a parent field in order to track change of status see the following example: https://stackblitz.com/edit/angular-kfmshi-nib6at

[sampow]

@aitboudad thank you. it works !