true, if end-users can select multiple shapes or cell ranges simultaneously; otherwise, false.
You can access this nested property as listed below:
|Object Type||Path to AllowMultiSelection|
If the AllowMultiSelection property is set to true, end-users can select multiple drawn objects (for example, pictures) or non-adjacent cell ranges in the worksheet simultaneously by holding down the CTRL key. If this property is set to false, multi-selection is not available in the SpreadsheetControl's UI. Note that the AllowMultiSelection option does not affect multi-selection in code.