Another WebListbox CSS Challenge - Different Header Background?

Targets Web
2

Try
Shown event:

ExecuteJavaScript( "$('#" + me.ControlID + "').addClass('disabledTable');" )

App HTML Header:

<style>
  .disabledTable .table th {
    background-image:linear-gradient(#9c9c9c, #707070 50%, #666666);
    color:white;
    white-space: nowrap; 
}
</style>

image

I hope this is what you want.