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Sorry for the post but I continue to try and try again what you wrote in 'or' Help Qlik Sense for Developers Version: 1.0.2 "but no nothing works without having to make changes !!!
You can post as a trivial application that working!.
In this case, I added the following code and does not enter into the foreach loop (Test(2) and Test(3))
My app contains 2 sheets with the following sheetobject
Sheet (1) "Il mio nuovo foglio"
SheetObject (1) : Type:table ID:sFq
SheetObject (2): Type:piechart ID:FUyeBYF
Sheet (2) "Sheet2"
SheetObject (1) : Type:linechart ID:LJHaM
//1) Test -
foreach (IGenericObject child in ASheet.Children )
{
Console.WriteLine("1) Test - Type:{0} ID:{1}", child.Info.Type, child.Info.Id);
}
//2) Test - this code does not enter
foreach (IPiechart child in ASheet.Children.OfType<IPiechart>())
{
Console.WriteLine(" 2) Test - Type:{0} ID:{1}", child.Info.Type, child.Info.Id);
}
//3) Test - this code does not enter
foreach (ILinechart child in ASheet.Children.OfType<ILinechart>())
{
Console.WriteLine(" 3) Test - Type:{0} ID:{1}", child.Info.Type, child.Info.Id);
}
//4) Test -
foreach (IGenericObject child in ASheet.Children )
{
Console.WriteLine(" 4) Test Type:{0} ID:{1}", child.Type, child.Id);
}
Output:
Test: Il mio nuovo foglio
1) Test - Type:table ID:sFq
1) Test - Type:piechart ID:FUyeBYF
4) Test Type:GenericObject ID:sFq
4) Test Type:GenericObject ID:FUyeBYF
Test: Sheet2
1) Test - Type:linechart ID:LJHaM
4) Test Type:GenericObject ID:LJHaM
NB. Delphi solution with OCX
procedure TXXX.GetSheetObjects(var ListObjectID: TStringlist;
const AObjectType: array of Smallint; ADoc: TQlikDocument; ASheet: Sheet);
var
i, j: Integer;
objs: OleVariant; // TSheetObjects;
obj: SheetObject;
begin
if ASheet <> nil then
try
// ListObjectID:=TStringList.Create;
if ASheet.Noofsheetobjects > 0 then
begin
objs := ASheet.GetSheetObjects;
For i := VarArrayLowBound(objs, 1) to VarArrayHighBound(objs, 1) do
begin
obj := TSheetObjects(objs);
for j := 0 to High(AObjectType) do
begin
if (obj as SheetObject).GetObjectType = AObjectType
begin
ListObjectID.Add((obj as SheetObject).GetObjectID);
break;
end;
end;
end;
end;
except
end;
end;
PS
Sorry if I insist with questions ... but there is the old function that performs GetSheetObjectbyID
.........."ActiveDocument.GetSheetObject("CH06")"...........
thank you in advance for your patience 
Corchi