QButton | An Easy to use , customizable button for Android | Android library

I have a function which generates a QGroupBox with a couple of other elements inside (Buttons, LineEdits, Checkboxes).

def generate_whole_form(self, testbed) -> QGroupBox:

This function is called in a loop, the returned QGroupBox is appended to an array (self.gridArray.append(current_groupbox)) and then put inside a QGridLayout (self.gridlayout.append(current_groupbox)).

I would now like to access the elemets inside the GroupBoxes and I figured there are two ways of doing it:

1. My generate_whole_form() returns not only the QGroupBox, but also all the other elements I need to deal with later on. Then I could save these handles within the loop.
2. I could do something like this: self.gridArray[number].findChild(QWidget.QButton, "my_set_objectName") to have access to the single UI elements.

Version 2 seems to be the easier option, as I would not need to manage all the returned UI objects. In fact, I already started implementing it this way, but for some reason, my program breaks, whenever I call findChild(). However, it works fine when I use findChildren().

I would like to know if one of the above mentioned ways is better than the other or if there is even a third way. If version two is preferred, what is going wrong when I use findChild()? How can I use this function correctly?