How to remove/hide the "currency pair name" in the top-left main chart

 

How to remove/hide the "currency pair name" in the top-left main chart.  I want to only display my indicator in main chart. How can I do that in MQL4?

Please don't suggest to change the color of foreground because I want to use other indicator in Sub-window. 

 
Musngi: Please don't suggest to change the color of foreground
Then it can't be done.
 
WHRoeder:
Musngi: Please don't suggest to change the color of foreground
Then it can't be done.

Then how can I use sub-window to put my second indicator? I prepared black background.