Hello Chin,yes you cannnot edit the theme file of the Grid and also you cannot remove the container since it is from the component.

but you can use the Class in your local theme (in test_CCK) editor and add display none to hide the container; 

• .datagrid-grouppanel:after { display: none; }

if it didnt work try adding important.

• .datagrid-grouppanel:after { display: none !important;  }

hello @Chin Kai 

Try this CSS:

.datagrid-grouppanel:after {    

 -servicestudio-display: none;

}

I hope this helps 

Thanks

Thanks but I managed to get it work with: 

.datagrid-grouppanel { display: none;}

I saw a post which says its not ideal to use ( !important;  } ) as it affects the next user who would have trouble overriding your own css