ax.GridAlphaMode = 'auto' don't use default transparency value of 0.15

Help says:

GridAlphaMode — Selection mode for GridAlpha
'auto' (default) | 'manual'
Selection mode for the GridAlpha property, specified as one of these values:

'auto' — Use default transparency value of 0.15.
'manual' — Use the manually specified transparency value. To specify the value, set the GridAlpha property.
Example: ax.GridAlphaMode = 'auto'

But I can't use it.

x            = 0:pi/360:2*pi;
y            = sin(x+pi);
hFigure            = figure;
hAxes            = subplot(1,1,1);
hLine            = plot(x,y);
hAxes.XGrid          = 'on';
hAxes.YGrid          = 'on';
hAxes.XLim          = [0  2*pi];
hAxes.XTick          = 0  : pi/6  :  2*pi;
hAxes.GridAlpha          = 0.5;
hAxes.GridAlphaMode        = 'auto';
% Axes plot grids with GridAlpha=0.5 
hAxes.GridAlpha          = 0.15;
% Axes plot grids with GridAlpha=0.15 
hAxes.GridAlphaMode        = 'auto';
% Axes plot grids with GridAlpha=0.15

Is it ok?

Answer 1

[Eugene]

The example is the little part of my programm. You must use to debug and set the breakpoint to first mentioning GridAlpha and then you must use step.

[Birdman]

?