Is the HeaderCells field required to build a functioning editable grid using a!gridLayout?

The HeaderCells field is indeed a necessary component when building a functioning editable grid using a!gridLayout. This field is utilized to define the labels for each column in the grid. Without this specification, the grid wouldn't know how to label the columns correctly, potentially leading to confusion in interpreting the data display and editing.

When constructing an editable grid, the header not only organizes the data but also provides a crucial interface for users to understand what each column represents, especially when they need to interact with that data for editing. Properly defined headers enhance usability by making the grid intuitive and user-friendly.

While other attributes of the grid may be optional or have default behaviors, the inclusion of HeaderCells is essential to ensure that the grid operates as intended, and users can effectively engage with the data presented.