Problem with dynamic_cast

[jacek]

I APPEND other elements and I creat new widgets,nothing else.
Each time I create an element, I set the position variable and create the widget. nothing more.
I add that,for what I see, I got errors only after creating the first widget. I mean, the first is ok,the others may be wrong.

When you add elements to a QVector (or std::vector), it sometimes must allocate more space for new elements and to achieve that it might have to move all elements to another place in the memory. If this happens, all pointers to previous elements will be invalid.

[vratojr]

Argh!Yeah! I've read this just some days ago...
Thank you very much!

[jacek]

You can either reserve enough space before you add elements (if you know their exact number) or use a vector of pointers.