LockedText Property [Excel 2003 VBA Language Reference]
True if the text in the specified object will be locked to prevent changes when the workbook is protected. Read/write Boolean.
Example
This example locks text in embedded chart one when the workbook is protected.
Worksheets(1).ChartObjects(1).LockedText = True
Applies to | ControlFormat Object
See Also | Protect Method | ProtectContents Property