class Test1 : public WithTest1Layout<TopWindow> {

WithGridLayout<ParentCtrl> Grid;                                           // <------ Grid should be declared here, or elswhere 
                                                                           //         so that it can be reached within the Test1 class.

public:
	typedef Test1 CLASSNAME;
	Test1(){
		CtrlLayoutOK(*this, "Window title");
		WithGridLayout<ParentCtrl> Grid;                            // <------ Grid is declared locally in constructor (The reason of the error.). 
		CtrlLayout(Grid);                                           
		tb.Add(Grid.SizePos(),"Tableau");
		Grid.arr.SizePos();
		
		Grid.arr.AddRowNumColumn();
		Grid.arr.AddColumn("Colonne 1").Sorting();
		Grid.arr.AddColumn("Colonne 2").Sorting();
		
		alim <<= THISBACK(fAlim);
	}
	void fAlim();
};