Array<ParentCtrl> array;
WithTestLayout<ParentCtrl> testLayout;
array.Add(testLayout);

array.Add(&testLayout);

Exception: C0000005 at     7FF727395F8A
EXCEPTION_ACCESS_VIOLATION
reading at 36705825540

Array<WithTestLayout<ParentCtrl> > layouts;
auto& testLayout = layouts.Add(); // <-- Creates the ParentCtrl with the given layout as its element.

TestWindow::TestWindow()
{	
        // Array<ParentCtrl> layoutArray;
        // Note that we're using static_cast here, for the sake of simplicity. When you have several layouts in same array, using One<>, which has RTTI support, or dynamic_cast would be better.

	auto& t = layoutArray.Add(new WithTestLayout<ParentCtrl>); // <-- Array "owns" the new ParentCtrl with layout. No need to delete explicitly.
	CtrlLayout(static_cast<WithTestLayout<ParentCtrl>&>(t));
        Add(t.SizePos()); 
	
}

class TestLayout : public WithTestLayout<ParentCtrl>
{
public:
    typedef TestLayout CLASSNAME;
    TestLayout() { CtrlLayout(*this); }
};

TestWindow::TestWindow()
{	
    Array<ParentCtrl> layoutArray;
    layoutArray.Add(new TestLayout);
    Add(layoutArray[0].SizePos());
}