I have a ComboBox where the user can select 1 or multiple choices. The choices are stored in a SharePoint choices list called 'Attributes List'. When the app first loads, it checks the first record in the list. If the first value under the 'Key Skills' column is equal to 'Any Skills', the DefaultSelectedItems for the ComboBox are to be set to all available choices. However, if the first value under this column is anything else, only that one value is to be set as the DefaultSelectedItem.
Here is the code I am using in the ComboBox DefaultSelectedItems property: