Which field in a!gridLayout defines the layout of the editable grid cells?

The field that defines the layout of the editable grid cells in a!gridLayout is the HeaderCells. This field is specifically designed to outline the structure of the grid's header, including the columns that will appear above the editable cells. By defining the header in this way, developers can specify attributes such as titles, widths, and any sorting options for the columns, thereby providing a clear organization for users.

In contrast, other fields serve different purposes within the grid. For instance, Rows determine the data that will be displayed in each row of the grid but do not dictate the layout structure itself. The Value field is used for specifying the actual data values to be displayed or edited within the cells, while the Label field is typically related to UI elements rather than defining grid layout. Thus, HeaderCells is integral for setting up the visual and functional structure of the editable grid.