Plotting Vertical Lines

Hey guys...

How can i plot a vertical line at certain points....

I just have been making values at certain lines
and drawing the lines, even if the value is flat
it comes out as horiz. line...

How can i create vertical lines? help!

C.

i mean , as a custom indicator in mql4...

ObjectCreate("Line Name",OBJ_VLINE,0,Time[index],0,0,0,0,0);

thanks!