RAD Studio VCL Reference
TComboBoxExStrings.SetUpdateState Method

Performs internal adjustments before or after a series of updates.

procedure SetUpdateState(Updating: Boolean); override;
virtual __fastcall SetUpdateState(Boolean Updating);

SetUpdateState is called at the beginning or end of a series of updates. When the BeginUpdate method is first called and the TCustomComboBoxStrings object is not already in the middle of an update, SetUpdateState is called with Updating set to true. When the EndUpdate method is called and it cancels out the last unmatched call to BeginUpdate, SetUpdateState is called with Updating set to false. 

SetUpdateState refreshes the combo box when Updating is false, so that the combo box reflects the new set of strings. 


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