I have 3 items. item1 and Item2 are belong to Group and Item3 is not belong to any group. How can I add item3 on the ultraListView? Below is my test code: Thanks

this.ultraListView1.View = UltraListViewStyle.Details;
UltraListViewGroup group1 = new UltraListViewGroup();
group1.Text = "Group1";
this.ultraListView1.Groups.Add(group1);

UltraListViewItem item1 = new UltraListViewItem();
item1.Key = "Item1";
item1.Value = "Item1";
this.ultraListView1.Items.Add(item1);
item1.Group = group1;

UltraListViewItem item2 = new UltraListViewItem();
item2.Key = "Item2";
item2.Value = "Item2";
this.ultraListView1.Items.Add(item2);
item2.Group = group1;

UltraListViewItem item3 = new UltraListViewItem();
item3.Key = "Item3";
item3.Value = "Item3";
this.ultraListView1.Items.Add(item3);

The result is only Item1 and Item2 are added beneath Group1, while Items3 is not added on the UltraListView at all.

;