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Is there any way to get hold of the left top grid outer cell (i.e. the one at position (-1;-1) )?

First of all, your grid window should have at least one outer header column at top and one header row on left. If this true, then you can instantiate header cells at top/left corner:

CExtGridWnd & wndGrid = . . .
LONG nColNo = 0;   // column index relatively to part of the grid (outer header part at top/bottom/left/right, outer corner part or inner data part)
LONG nRowNo = 0;   // row index relatively to part of the grid (outer header part at top/bottom/left/right, outer corner part or inner data part)
INT nColType = -1; // -1 - header or corner area at left, 0 - middle data area, 1 - header or corner area at right
INT nRowType = -1; // -1 - header or corner area at top, 0 - middle data area, 1 - header or corner area at bottom
CExtGridCell * pCell =  wndGrid.GridCellGet( nColNo, nRowNo, nColType, nRowType, RUNTIME_CLASS( CExtGridCellHeader ) );
      pCell->TextSet( _T("top-left"));