XY dot renderer point size

I’ve got an XY plot rendered with the XY Dot Renderer. Im having similar problems increasing the dot size.
Looking in the Chart Customizer there still doesn’t seem to be any pen customization still, besides the series colors.

I’ve tried the code posted above, which worked, but I’ve had to use a button on click script to get it to invoke.

I wanted to put the code under the Charts Extension Function “Configure Chart” but couldn’t figure out why the function wasn’t getting invoked. Can anyone tell me when this extension is supposed to be invoked?

I don’t want to have to put the code to increase button size on a window initialize script or something silly, when it should be configurable on the chart itself. Cheers