How to get price scale min and max values at any time?

Apologies everyone. Should not have started a thread. Rookie mistake. As far as a resolution to the problem, there isn't one. Moving on....
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The Plot method exposes the min and max values corresponding to the displayed price scale and that is great, but I need to retrieve these min and max values (or their equivalent) when a bar closes or when triggered by some arbitrary event. Can this be done?

I should explain what exactly I want to achieve. I want to place a string at a fixed X location but have the string hug the bottom of the price panel while the panel is being scrolled. I was exploring the possibility of using the Plot method min value for this because it represents the lower price scale value displayed on the screen at any point in time.

Thanks for your help,
Steve