You can use one of the following methods to add a child C1ListViewItem to your C1ListView control
Right-click the C1ListView and select Add Child | ListView normal item from the menu. This will add a child item to the C1ListView control.
Select the C1ListView control to which you wish to add a child item. Click the Add Child Item button in the Designer Form TaskBar to add a C1ListViewItem.
Select the C1ListView to which you wish to add a C1ListViewItem. Click the Edit menu and select Add Child Item | ListView normal item from the menu.
Note: You can also add a child item to a C1ListViewNestedItem using one of the methods above.