I am new to the Infragistics components is it therefore possible to place a small example or explain to me where I can find an example. I working on a listview with three columns. The user shall be able to set the checkbox for a listview item. And then select a value in the second and third column by using a dropdown box.

 So I need to ad a Infragistics.Win.UltraWinListView.UltraListViewItem and two instances of Infragistics.Win.UltraWinListView.UltraListViewSubItem to the listview. You are talking about the editor property but I cannot find this property?

Sub-items cannot be edited, so you can't get a dropdown in a sub-item column. You can still use the ValueList to define what gets displayed for those sub-items (see below).

//  Set the View to 'Details'
this.listView.View = UltraListViewStyle.Details;

//  Display checkboxes
this.listView.ViewSettingsDetails.CheckBoxStyle = CheckBoxStyle.CheckBox;

//  Change the caption for the main column
this.listView.MainColumn.Text = "One";

//  Add columns
this.listView.SubItemColumns.Add( "Two" );
this.listView.SubItemColumns.Add( "Three" );

//  Create a ValueList and add some items
ValueList vl = new ValueList();
vl.ValueListItems.Add( 0, "Zero" );
vl.ValueListItems.Add( 1, "One" );
vl.ValueListItems.Add( 2, "Two" );
vl.ValueListItems.Add( 3, "Three" );

//  Assign the ValueList to both sub-item columns; note that
//  you could also assign a separate instance to each column.
this.listView.SubItemColumns["Two"].ValueList = vl;
this.listView.SubItemColumns["Three"].ValueList = vl;

//  Add items with sub-items
for ( int i = 0; i < 10; i ++ )
{
    UltraListViewItem item = this.listView.Items.Add( null, string.Format("Item {0}", i) );
    item.SubItems[0].Value = i % 2;
    item.SubItems[1].Value = i % 3;
}