Class: TEgFireGridColumn
property Required: Boolean;Whether the column must have a value: the editors refuse to empty a cell of a required column (a text, number or memo made empty, a date or lookup made null), with the dataset’s “field must have a value” message. A cell that was already empty is left to the dataset’s own checks when the row is posted.
Until it is assigned, it is the field’s Required, read
from the dataset each time. Assigning it gives the column its own value
(cvRequired in AssignedValues);
RestoreDefaults
goes back to the field’s.