WdtGrid has 4 area type.

    You can change rowHeight in header, content, header summary, footer summary

    Default row height is 23px

    - set header row height.
        (ex) grid1.setRowHeight(50, 'header');

    - set content row height.
        (ex) grid1.setRowHeight(50, 'content');

    - set header summary row height.
        (ex) grid1.setRowHeight(50, 'sum'); 

    - set footer summary row height.
        (ex) grid1.setRowHeight(50, 'footer');

    - all row height :
        (ex) grid1.setRowHeight(100);