elm_radio_group_add in a genlist causes Segfault

I am trying to create radio buttons in a genlist.  I am able to succesfully create the genlist, add several items, and add radio buttons onto the items.  That works fine.

However, if I try to add the radio buttons to a group (in the get content callback), I get a segfault (see the line below with SEGFAULT comment) when adding the button to the group.  I confirmed that m_group is properly set to the address of the last radio button added.

Evas_Object* TTL_GenList_Radio::cb_entry_icon_get(void *id, Evas_Object *obj, const char *part) {
    return ((TTL_GenList_Radio*)((Titem_data*)id)->thisGenlist)->entry_icon_get((Titem_data*) id, obj, std::string(part));

Evas_Object* TTL_GenList_Radio::entry_icon_get(Titem_data* id, Evas_Object *obj, const std::string part)

	if (part != "elm.swallow.end") return NULL;

	// Add the button to the genlist item
	Evas_Object* radio = elm_radio_add(obj);  
	elm_radio_state_value_set(radio, id->buttonValue);

	// Add to group (or set first button as group)
	if (m_group == nullptr) m_group = radio;
	else elm_radio_group_add(radio, m_group);  // SEGFAULT HERE


	// Set callback for changed function
	evas_object_smart_callback_add(radio, "changed", TTL_GenList_Radio::cb_changed, this);

	return radio;

Can someone explain why I am segfaulting when adding the radio to the group?  (I made a simple standalone example of adding radio buttons to a box, and groupping them, and that worked fine)


I suspect it has something to do with the 'get content callback' function.  Is the passed in object released after it is rendered - which causes the button to be released?  That would explain why trying to group with the (now released) previous button results in a segfault.  I just don't know how to solve this.

Edited by: Michelle Dupuis on 04 Nov, 2019