Controling Width of line

Hi Frendz

I m drawing a line using this peice of code
axMPCtrl.ActiveMap.Shapes.AddLine(objLoc1,objLoc);

this draw a FAT line.I need a hairline width.

please tell me how can I control the width of the line.

Ta
Thanxx in Advance

Enable the drawing toolbar and then select the hairline from it.