How to draw a vertical line *but* keeps its position *related to* the screen - page 2

 
The only problem I have is the code just won't update per tick; it only executes once (when hitting F5 in MetaEditor) :(
Bar's 15 ago don't change. Perhaps:
ObjectMove(SYMM_ARROW, 0, Time[WindowFirstVisibleBar()-15], Close[0]);
 

Here is the correct way to do it:

https://www.mql5.com/en/articles/1503 > Section "Using the Font Wingdings"

By using a symbolic font (Wingdings) Corresponded with OBJ_LABEL prop, things can be done perfectly.

Reason: