Initialization problem with custom containers in a vector

Hi,

Consider the following two CustomContainers and the Screen class :

class CustomContainer : public touchgfx::Container
{
 
public:
 
 CustomContainer()
 {
 add(_a_text_area);
 }
 void setup(); //a function to setup the element
 void writeText(const std::u16string txt)
 {
 _a_text_area.setVisible(false);
 _a_text_area.invalidate();
 _txt_buffer = txt;
 _a_text_area.setWildcard((uint16_t*)&_txt_buffer[0]);
 _a_text_area.resizeToCurrentText();
 _a_text_area.setVisible(true);
 _a_text_area.invalidate();
 }
private:
 touchgfx::TextAreaWithOneWildcard _a_text_area;
 std::u16string _txt_buffer;
};
 
class CustomContainerBis : public touchgfx::Container
{
 
public: 
 CustomContainerBis();
 void setup(const uint8_t elements_nb)
 {
 //here, I've tried various other solutions to setup the vector 
 _custom_containers = std::vector<CustomContainer>(6, CustomContainer());
 
 
 //place CustomContainer objects and set them up 
 int y = 0;
 for (int i = 0; i < 6; i++)
 {
 _custom_containers[i].setup();
 _custom_containers[i].setPosition(0, y, 50, 15);
 add(_custom_containers[i]);
 y += 20;
 }
 
 setWidth(15);
 setHeight(y);
 }
 void fillInElements()
 {
 for (int i = 0; i < (int)_custom_containers.size(); i++)
 {
 _custom_containers[i].writeText(u"a_text");
 }
 }
 
private:
 std::vector<CustomContainer> _custom_containers;
};
 
 
class Screen : public ScreenBase
{
public:
 Screen()
 {
 _a_custom_container.setXY(20, 20);
 _a_custom_container.setup(5);
 add(_a_custom_container);
 }
 
 void aFunction()
 {
 _a_custom_container.fillInElements();
 }
private:
 CustomContainerBis _a_custom_container;
}

In this code, the line _a_text_area.invalidate() within the function writeText() throws an error message (reference to unknown object). What is it I'm doing wrong? I suspect it has to do with the call to the add(_a_text_area) fuction which is inside the default constructor…

Any help is more than welcome ! I've been struggling with this for quite some time now and tried a lot of different things… Ofc I can make it work by creating a vector of pointers to CustomContainer but It's not something I wish to do.

Guillaume.

Ps : excuse if there are any mistakes that slipped in the code above, I wrote it all off the top of my head…