Hello BetoValle,

    void Close() override {
        delete this; // error show heap is corrupted !!!!
    }
 

I don't think there is any bug in U++. You are trying to delete an object within the same object. That call to TopWindow::Close() will return to its caller, which is the TopWindow itself, and it will be a freed memory address. So you get heap corruption. Never do that.

Not to mention the SMain instance (se) is allocated on stack. You don't need to delete it anyway.