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questions about the separation line

I want to add separation line between some rows. Just like one line shown in group by function.

Can the grid support this function??

The grid doesn't support separate line as a separate entity, but you can achieve the same effect through css styles ( as it done in case of grouping ) 

mygrid.setRowTextStyle(rowID,"border-bottom:2px solid black;"); //will add a line below the row