view insert index ?prop value ...?
Insert a row into view as the index-th row. Existing rows with indices >= index get pushed up. Initialize the properties prop in the new row with the corresponding value; other properties get default value for their type.
Returns the integer index of the inserted row.
The command [view insert end] is the same as [mk::row append path] except it appends a row to the end of view rather than to the end of a view indicated by path.