So the items property, it drives what the "total viewable/selectable things are".
A drop down by default, is a single select and it automatically selects the first item, but you can turn that off.
For a dropdown, the Default Is where select which item is selected (versus the default of the first item)
So in the Dropdownsample if it was ["1","2","3"]
By default you'd see 1 selected and 1 2 3 as the options. If you wanted 2 to be shown as the selected, because the data you want to display already has an option in your data storage, you'd set the Default to 2. (you'd do it progrmatically, not hard code it to 2)
For ComboBoxes
It works like a Dropdown and Multi-select dropdown in one, meaning
1. You can set a ComboBox to only allow 1 selectable like a Dropdown
2. You can set a ComboBox to allow you to select multiple items
If you do #1, and if you saved the data and later wanted to display the selected "data point" then you would use the Default property.
If you do #2, and selected multiple items, then you have to set them in the DefaultSelectedItems as its Table of records, not a Single record.
Imagine this.
1. You have a Gallery of data or a Table in the UI
2. You select a record
3. You want people to see (view) the data in a new form. You would use the Gallery.Selected property to then populate the Form with data.
each control ON the form would show the Value that was in the Gallery (aka loaded from your datasource)
But imagine now that you want to Edit that record not view it.
Further imagine you have a list of options for a Column.
You would want 2 things
1) to load all the possible options it COULD be in the Items property
2) Have the "selected" or "selecteditems" property set to the currently loaded records data, so you can see what its currently set to. then change it, and then save it.
So in what you just typed, you simply have a list of data (the dropdownsample), and since you have no Default value set, it woudl just select 1 (assuming thats the first data point)
