how to draw line in different colors ?

[surabhi-1694]

i am trying to draw line in different colors though i am able to change color of line from white to Different color BUT the problem is the selected color apply to all the Lines What i am trying to achieve is if i select color red line should be in red color then if yellow color is selected the next line should be in yellow color and the previous drawing(line) should remain in red if any one can help to Achieve this Thanks.