Type:System.Boolean
if true, pre-selection is enabled.
ignoreUnacceptablePreselectedObjects
Type:System.Boolean
If true and some acceptable objects are pre-selected, then any unacceptable pre-selected objects are ignored. If false and any unacceptable are pre-selected, then the user is forced to post-select.
Remarks
By default, if valid input is pre-selected when GetObjects() is called, then that input is returned and the user is not given the opportunity to post-select. If you want to force the user to post-select, then call EnablePreSelect(false).