Why are Groups not added to my ListView?
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With this code:

    Dictionary<int, String> PlatypusAccountsDict = PlatypusSetupData.getPlatypusAccountsForCustomer(kvp.Key);
    foreach (KeyValuePair<int, string> entry in PlatypusAccountsDict) {
    	int PlatypusAccountNumber = entry.Key;
    	string PlatypusAccountName = entry.Value;
    
    	ListViewGroup PlatypusAccountGroup = new ListViewGroup(PlatypusAccountName, HorizontalAlignment.Left)
    	{
    		Tag = PlatypusAccountNumber,
    		Header = PlatypusAccountName
    	};
    	listViewCustomerDuckBillAccountsClients.Groups.Add(PlatypusAccountGroup);
    . . .

...I can step through and see that there are values in "entry," yet no group is added to my ListView - it's still naked as a jyabird after this code runs. I know there are three possible reasons for this problem: 1) I forgot a step. 2) A gigantic EMP from the sun has broken something, or 3) Something else I'm unaware of.