Add a new row at the end of rows array based on values from Insert Row.
function AddInsertRow: Boolean; override;
Add a new row at the end, assign InsertValue (INxBaseCell) property of each column to associated cell in newly added row.
OnInsertRowQuery event is triggered before row is actually added. It include Accept (var) parameter used for rejecting new row from being added.
This method is called internally after used leave Insert-row by clicking on body area.