chart background issue

[dev060]

Hi..

widgetOptions = {
... , // other properties

overrides: {
    "paneProperties.background": "#FFFFFF",
    "paneProperties.backgroundType": "solid",
}

}

I used this option but chart background is not changed. it's using default gradient background
Other properties work fine.

In fact, the custom background color is reflected only on the first load, and default gradient background color is used from subsequent loads (even for only chart reload).

Can you help me on it?
Thanks