You can set grid in inspection.GridColor property can change grid's color,GridHeight property sets the grid's height,GridPenSize property sets grid's pen size,GridShow property can hide or show grid on TCAD,GridType property can change grid style and GridWidth property sets grid's width.

Also,you can do it by code.

Code example:

procedure TMainFrm.Button5Click(Sender: TObject); 
begin 
  MyCAD1.GridOperation.GridColor:=clGreen; 
  MyCAD1.GridOperation.GridHeight:=20; 
  MyCAD1.GridOperation.GridWidth:=20; 
  MyCAD1.GridOperation.GridPenSize:=2; 
  MyCAD1.GridOperation.GridType:=gPixel 
  //... 
end;