Hi Gurnam,
The line that you can request with the checkbox in the Columns dialog isn't
changeable -- it's always black.
If your columns are always the same length, you can fake it. Turn off the
regular line between the columns. Open the header pane, display the Drawing
toolbar, and use the Line tool to draw a line in the same place. Change the
color of the drawing line by using the Line Color tool on the toolbar. Then
close the header pane. The same line will appear on every page.
