Grid in Virtual Interface data mode uses custom COM interface to access data. Data itself must be stored and maintained by application. Virtual Interface data mode advantages are speed and flexibility. To use this mode, you need to create object that implement IsgGridDataSource interface and assign that object to the SimpleDataSource property. In Visual Basic, Implements keyword is used to implement interface in class or form module.

The IsgGridDataSource interface contains these functions:

• AddRow Called when a new row should be added the data source.
• DeleteRow Called when a row should be deleted from the data source.
• GetRowCount Returns number of rows provided by the data source implementation.
• GetRowData Called to retrieve data for the specified row.
• SetRowData Called to modify row's data.

Note: this mode doesn't use bookmarks.