private void CreateCommentRelationship()
{
CommentShape shape1 = first as CommentShape;
CommentShape shape2 = second as CommentShape;
if (shape1 != null)
{
diagram.AddCommentRelationship(shape1.Comment, second.Entity);
}
else if (shape2 != null)
{
diagram.AddCommentRelationship(shape2.Comment, first.Entity);
}
else
{
MessageBox.Show(Strings.ErrorCannotCreateRelationship);
}
}