public static IPlugInWrapper GetPlugInWrapper( 
   string id,
   bool create
)

var plugin = FrameworkApplication.GetPlugInWrapper("esri_editing_EditVerticesText");
if (plugin.Enabled)
  ((ICommand)plugin).Execute(null);

IPlugInWrapper wrapper = FrameworkApplication.GetPlugInWrapper("esri_editing_ShowAttributes");
var command = wrapper as ICommand; // tool and command(Button) supports this

if ((command != null) && command.CanExecute(null))
  command.Execute(null);

// use SetCurrentToolAsync
FrameworkApplication.SetCurrentToolAsync("esri_mapping_selectByRectangleTool");

// or use ICommand.Execute
ICommand cmd = FrameworkApplication.GetPlugInWrapper("esri_mapping_selectByRectangleTool") as ICommand;
if ((cmd != null) && cmd.CanExecute(null))
  cmd.Execute(null);

private void ChangeCaptionImage()
{
  IPlugInWrapper wrapper = FrameworkApplication.GetPlugInWrapper("MyAddin_MyCustomButton");
  if (wrapper != null)
  {
    wrapper.Caption = "new caption";

    // ensure that T-Rex16 and T-Rex32 are included in your add-in under the images folder and have 
    // BuildAction = Resource and Copy to OutputDirectory = Do not copy
    wrapper.SmallImage = BuildImage("T-Rex16.png");
    wrapper.LargeImage = BuildImage("T-Rex32.png");
  }
}

private ImageSource BuildImage(string imageName)
{
  return new BitmapImage(PackUriForResource(imageName));
}

private Uri PackUriForResource(string resourceName)
{
  string asm = System.IO.Path.GetFileNameWithoutExtension(
      System.Reflection.Assembly.GetExecutingAssembly().Location);
  return new Uri(string.Format("pack://application:,,,/{0};component/Images/{1}", asm, resourceName), UriKind.Absolute);
}