uses
  ... cxCustomData, cxGridTableView, ...
// This form contains the ExpressQuantumGrid with an unbound TableView.
TForm2 = class(TForm)
  cxGrid1Level1: TcxGridLevel;
  cxGrid1: TcxGrid;
  cxGrid1TableView1: TcxGridTableView;
end;
// Creates a drilldown data source for a particular cross cell and displays its data in a form.
procedure cxShowDrillDownDataSource(ACrossCell: TcxPivotGridCrossCell);
  // Creates columns in the grid's TableView for all the pivot grid fields.
  procedure CreateColumns(APivotGrid: TcxCustomPivotGrid; AGridView: TcxGridTableView);
  var
    I: Integer;
    AField: TcxPivotGridField;
  begin
    for I := 0 to APivotGrid.FieldCount - 1 do
    begin
      AField := APivotGrid.Fields[I];
      with AGridView.CreateColumn do
      begin
        Caption := AField.Caption;
        Visible := AField.Visible;
        Hidden := AField.Hidden;
      end;
    end;
  end;
var
  AForm: TForm2;
  ADataSource: TcxCustomDataSource;
begin
  AForm := TForm2.Create(nil);
  try
    CreateColumns(ACrossCell.PivotGrid, AForm.cxGrid1TableView1);
    ADataSource := ACrossCell.CreateDrillDownDataSource;
    try
      // Links a drilldown data source to the grid's TableView.
      AForm.cxGrid1TableView1.DataController.CustomDataSource := ADataSource;
      AForm.ShowModal;
    finally
      ADataSource.Free;
    end;
  finally
    AForm.Free;
  end;
end;
// The pivot grid's OnDblClick event handler.
procedure TForm1.cxDBPivotGrid1DblClick(Sender: TObject);
var
  ACrossCell: TcxPivotGridCrossCell;
begin
  with cxDBPivotGrid1.HitTest do
  begin
    // Handles double-clicks on data cells
    if HitAtDataCell then
    begin
      // Determines a cross cell which corresponds to the data cell being clicked.
      ACrossCell := TcxPivotGridDataCellViewInfo(HitObject).CrossCell;
      cxShowDrillDownDataSource(ACrossCell);
    end;
  end;
end;

//unit2.h
//---------------------------------------------------------------------------
class TForm2 : public TForm
{
__published: // IDE-managed Components
        TcxGridLevel *cxGrid1Level1;
        TcxGrid *cxGrid1;
        TcxGridTableView *cxGrid1TableView1;
private: // User declarations
public: // User declarations
        __fastcall TForm2(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm2 *Form2;
// Creates a drilldown data source for a particular cross cell and displays its data in a form.
void cxShowDrillDownDataSource(TcxPivotGridCrossCell *ACrossCell);
//unit2.cpp
// Creates a drilldown data source for a particular cross cell and displays its data in a form.
void cxShowDrillDownDataSource(TcxPivotGridCrossCell *ACrossCell)
{
  TForm2 *AForm = new TForm2(NULL);
  try {
    // Creates columns in the grid's TableView for all the pivot grid fields.
    for(int I = 0; I < ACrossCell->PivotGrid->FieldCount; I++) {
      TcxPivotGridField *AField = ACrossCell->PivotGrid->Fields[I];
      TcxGridColumn *AColumn = AForm->cxGrid1TableView1->CreateColumn();
      AColumn->Caption = AField->Caption;
      AColumn->Visible = AField->Visible;
      AColumn->Hidden = AField->Hidden;
    }
    TcxCustomDataSource *ADataSource = ACrossCell->CreateDrillDownDataSource();
    try {
      // Links a drilldown data source to the grid's TableView.
      AForm->cxGrid1TableView1->DataController->CustomDataSource = ADataSource;
      AForm->ShowModal();
    }
    __finally {
      delete ADataSource;
    }
  }
  __finally {
    delete AForm;
  }
}
// unit1.cpp
void __fastcall <TForm>::DBPivotGridDblClick(TObject *Sender)
{
  // Handles double-clicks on data cells
  if(cxDBPivotGrid1->HitTest->HitAtDataCell) {
    // Determines a cross cell which corresponds to the data cell being clicked.
    TcxPivotGridCrossCell *ACrossCell =
      ((TcxPivotGridDataCellViewInfo*)cxDBPivotGrid1->HitTest->HitObject)->CrossCell;
    cxShowDrillDownDataSource(ACrossCell);
  }
}