Hi Neelesh,

You need a separate FieldLayout for each level.  Right now you have a single FieldLayout that is being used by both the parent and child rows so if you set the LabelLocation to hidden on this layout it will become hidden at every level.  You should have two FieldLayouts in your grid, one for the parent rows and one for all of the child rows.  Then inside AssigningFieldLayoutToItem you will assign the appropriate FieldLayout depending on whether the item is a parent or child item.  Inside the child FieldLayout is where you will set the LabelLocation to hidden.

Hi,

I already have a master layout to which I have added dynamic columns.

Now on top of this when I add parent and child layout as you mentioned it's not working and the grid comes up empty. 

Also I did this in the AssigningFieldLayoutToItem event.

if (args.ParentExpandableFieldRecord == null)
{
//do nothing
}
else
{
args.FieldLayout.Settings.LabelLocation = LabelLocation.Hidden;
}

but doing this removes label from the top of the grid also.