protected void Insert( 
   int index,
   object item
)

Protected Sub Insert( _
   ByVal index As Integer, _
   ByVal item As Object _
) 

Parameters

index

The zero-based index at which item should be inserted.

item

The item being added to the gallery.

All items added to the ItemCollection must be created on the main UI thread as these ultimately become the content of buttons added to the gallery popup control.

Target Platforms: Windows 10, Windows 8.1, Windows 7

Reference

Gallery Class
Gallery Members