There are some manual actions to control the vertical scale. I know the next:
Ctrl+Left Click (on the Y axis) to scroll up/down the chart
Left click (on the Y axis) to asjust the scale
Changing properties of the Right Scale:
Range
Maximun
Minimun
The question is . Can you do any of that actions programmatically?.
Note.-I think you can simulate to send keystrokes , but that is like to "use a sledgehammer to crack a nut" - In Spanish we say something like (Matar moscas a cañonazos) " To kill flies with cannons" ... overkill
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