SMART datagrid v.1 > Classes > MaskCellEditor
If it is false, it will be edited in overwrite mode.
In other words, it will overwrite the character of existing location with the newly entered character.
Defaults to true.
grid.setColumns([{
fieldName: "fld0",
editor: {
type: "mask",
mask: 'LLL-000',
insertMode: false
},
...
},
...
];