Annotation Extensions corrupted after executing Import command

[User (Legacy)]

I have a chart with annotations and a custom button on the toolbar to export 

these annotations.

.

If I initialize annotations, perform a data import and then try to add and 

enable a custom toolbar command, I get an exception saying cannot reference 

disposed object G. The data import is from a memory stream that does not 

contain extensions.

For example:

     //Init annotations

    annotx = new AnnotationX();

    annotx.Enabled = true;

    Extensions.Add(annotx);

...

    //Import the settings

    MemoryStream ms = new MemoryStream(config);

    Import(FileFormat.XML, ms);

.....

    //Create a toolbar command for saving annotations

    Command saveAnnotationCommand = 

annotx.Commands.AddCommand(saveAnnotationCommandID);

    saveAnnotationCommand.Text = "Save Annotations";

    int picIndex = annotx.Commands.AddPicture(imageList1.Images[0]);

    saveAnnotationCommand.Picture = picIndex;

    saveInsertPosition = annotx.ToolBarObj.Length;

    annotx.ToolBarObj.InsertAt(saveInsertPosition);

    annotx.ToolBarObj[saveInsertPosition] = saveAnnotationCommandID;

    annotx.ToolBarObj.Commands[saveAnnotationCommandID].Enabled = false; 

//<<Exception generated here

If I reinitialize annotations again after the Import command, the exception 

is not generated and the annotations work normally.

The export command used prior to the import did not include extensions, so I 

expected my existing annotations to be preserved.

    MemoryStream ms = new MemoryStream();

    this.FileMask = FileMask.Colors |

    FileMask.Elements |

    FileMask.Fonts |

    FileMask.General |

    FileMask.Multi |

    FileMask.Scale;

    this.Export(FileFormat.XML, ms);

It would seem that the import command is changing the annotation extension 

which requires me to reinitialize my toolbar even though the export stream 

does not include annotations.