Fixed Scale Maximum Minimum

Is there a function call or command in MT4 that allows me to control the Scale Fix of a chart , both the Fixed Minimum and the Fixed Maximum, from the indicator I have written? If so, what are the function names of these or has anyone written custom functions for them. Any help would be appreciated.

See the red circled area of the screen shot.

Clarification, I mean window 0 the main chart. not a separate window.

For a sub window you can use:

#property indicator_maximum
#property indicator_minimum

Yes I knew about these for the windows > 0 , but I want to control the scale of the chart window.

Thanks for the help.

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