ProtectSelection Property [Excel 2003 VBA Language Reference]
True if chart elements cannot be selected. Read/write Boolean.
When this property is True, shapes cannot be added to the chart, and the Click and DoubleClick events for chart elements don't occur.
This property is not persisted when the file is saved. If you set this property to True and then reopen the file, it will no longer be set to True.
This example prevents chart elements from being selected on embedded chart one on worksheet one.
Worksheets(1).ChartObjects(1).Chart.ProtectSelection = True
Applies to | Chart Object