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如何更改dbgrid网格线的颜色?

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void   __fastcall   tform1::dbgrid1drawcolumncell(tobject   *sender,  
              const   trect   &rect,   int   datacol,   tcolumn   *column,  
              tgriddrawstate   state)  
  {  
   
   
            dbgrid1->canvas->textrect(rect,rect.left,rect.top,column->field->text);  
            dbgrid1->canvas->pen->color=clred;  
            dbgrid1->canvas->moveto(rect.left,rect.-1);  
            dbgrid1->canvas->lineto(rect.left+rect.width(),rect.-1);  
            dbgrid1->canvas->lineto(rect.left+rect.width(),rect.bottom);  
   
  }