The SWT RowLayout layout manager lays out its components in rows, but is more robust than FillLayout.
With RowLayout, you can set the rows to be in vertical or horizontal style. For the horizontal style, widgets are placed to the left and right of each other. In vertical style, widgets are placed above and below each other.
Dropping or moving widgets within a RowLayout works similarly to other layout managers in the visual editor. As you move your cursor on the Design view, a black bar indicates where the widget will be dropped or moved. If the RowLayout is set to the vertical style, a horizontal black bar will be above or below any existing widgets. If the RowLayout is set to the horizontal style, a vertical black bar will show placement to the left or right of existing widgets.
To set the RowLayout options for a container using RowLayout layout manager: