So far good, but where are you allocating the object, that is only thing missing.

Here is a generic example
Qt Code: 
  1. template <typename T>
  2. T *** New2DArray(int rows, int cols)
  3. {
  4.     T *** array = new T**[rows];
  5.  
  6.     for(int r = 0; r < rows; ++r)
  7.     {
  8.         array[r] = new T*[cols];
  9.  
  10.         for(int c = 0; c < cols; ++c)
  11.             array[r][c] = new T;
  12.     }
  13.  
  14.     return array;
  15. }
  16.  
  17. template <typename T>
  18. void Delete2DArray(T *** array, int rows, int cols)
  19. {
  20.     for(int r = 0; r < rows; ++r)
  21.     {
  22.         for(int c = 0; c < cols; ++c)
  23.             delete array[r][c];
  24.  
  25.         delete[] array[r];
  26.     }
  27.  
  28.     delete[] array;
  29. }
  30.  
  31. ...
  32. QGraphicsRectItem *** objRect = New2DArray<QGraphicsRectItem>(rows, cols);
  33. ...
  34. Delete2DArray(array, rows, cols);
  35. ...
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