This article provides an example for how to add a caption and ribbon group for an extension view menu option.

Example
public string GetCaption()
{
return "Extension name";
}
//--------------------------------
public string GetGroup()
{
return "Extension Ribbon Group";
}
//--------------------------------
public bool SupportsItem(IswItem AItem)
{
// if true is returned the Extension will be visible in swExplorer
bool showExtension = true;
return showExtension;
}