Disable specific row in drop down/advanced grid

Hi,

I am trying to make a specific row in drop down menu as unselectable. All the other records in  the widget should be selectable except for one row.

Similarly, a specific row in advanced grid should be unselectable.However, all the other records should be selectable.

Using row format property, I was able to change the styles of particular row. I have attached screenshot for reference in which CSP Packaging is grayed out but I also want to disable its selection.Any lead on this is appreciable.

Regards,

MishiK