int DeleteString( UINT nIndex );
nIndex
Specifies the index to the string that is to be deleted.
Deletes a string in the list box of a combo box.
If the return value is greater than or equal to 0, then it is a count of the strings remaining in the list. The return value is CB_ERR if nIndex specifies an index greater then the number of items in the list.
CComboBox::InsertString, CComboBox::AddString, CB_DELETESTRING