Inventor.AssemblyDocument oDoc = (Inventor.AssemblyDocument)oApp.ActiveDocument;
Inventor.AssemblyComponentDefinition oCD = oDoc.ComponentDefinition;
Inventor.SelectSet oSelectSet = oDoc.SelectSet;
Inventor.ComponentOccurrence oOcc = oCD.Occurrences.ItemByName["test"];
oSelectSet.Select(oOcc);
oApp.CommandManager.ControlDefinitions["AssemblyBonusTools_GroundAndRootComponentCmd"].Execute();