Adds a control of the type RibbonButton, RibbonComboBox, RibbonLabel, RibbonListView, RibbonTextBox or RibbonSeperator to the end of the collection.
[C#] public int Add(System.Windows.Forms.Control item);
[Visual Basic] Public Function Add(ByVal item As System.Windows.Forms.Control) As Integer
The control to be added to the end of this collection.
The collection's index at which the value has been added.
If the RibbonItemCollection is optained by a HorizontalRibbonGroup controls are added to the group's first row.