SpreadSheet data style

I’m working with Webix SpreadSheet. What can be the reason that the data ‘style’ attribute remains empty when the table cell is filled with data? All other attributes are filled out automatically (‘row’, ‘column’, ‘value’).

But if I set the background color first, for example, then the ‘style’ attribute (I mean css class) is assigned. Why the css class isn’t assigned for newly filled cell without any style?

Hello,

Could you provide an example of a datasource that you are loading in SpreadSheet ?