All shapes in a worksheet are contained in the ShapeCollection, accessible via the Worksheet.Shapes property. Use the GetSelectedShapes method to get the list of shapes selected in the worksheet. To select multiple shapes simultaneously, use the Worksheet.SetSelectedShapes method. To specify whether multi-selection is available to end-users in the SpreadsheetControl, use the SpreadsheetSelectionOptions.AllowMultiSelection option, accessible via the SpreadsheetControl.Options.Behavior.Selection.AllowMultiSelection notation.
The SelectedPicture, SelectedShape, GetSelectedShapes and SetSelectedShapes members of the SpreadsheetControl or SpreadsheetControl object allow you to select shapes in the worksheet that is currently active in the control.