WPF

When we copy the content of multiple cells (Rows X Columns) with border (Outer Border / All borders) from excel sheet and paste the copied content in to System.Windows.Controls.RichTextBox in the WPF window the content are pasted inside the text box with some of the borders are not present in the pasted content.  We have also tried approach like converting the Clipboard text to XAML / HTML but no luck

RootItem
  SubNode1
  SubNode2
  SubNode3
  SubNode4
  SubNode5 <- This node is selected
--- Border which enables scrollbar
  SubNode6
  SubNode7
  SubNode8
  SubNode9 <- Right click here

capture.Start(); // start capture from webcam
            previewWindow.Background = capture.Brush; 
            ContrastAdjustEffect effect = new ContrastAdjustEffect();
            effect.Brightness = 1.2;
            effect.Contrast = 1.2;
            previewWindow.Effect = effect;

public class ErrorStatus : INotifyPropertyChanged
{
        #region Properties
        bool _hasError = false;
        public bool HasError
        {
            get { return _hasError; }
            set 
            { 
                _hasError = value; 
                this.RaisePropertyChanged("HasError");
            }
        }

        string _text = String.Empty;
        public string Text
        {
            get { return _text; }
            set
            {
                _text = value;
                if (value != String.Empty)
                    HasError = true;

                this.RaisePropertyChanged("Text");
            }
        }
        #endregion

        public void Add(String error)
        {
            Text = error;
        }

#region INotifyPropertyChanged Interface
        public event PropertyChangedEventHandler PropertyChanged;
        protected virtual void RaisePropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }
        #endregion
}

public interface IService : INotifyPropertyChanged
{
#region Properties
ErrorStatus ServiceStatus{get;}
#endregion

void TestMethod();
}

public class MyService : IService
{
        private ErrorStatus _serviceStatus = new ErrorStatus();
        public ErrorStatus ServiceStatus
        {
            get { return _serviceStatus; }
            private set
            {
                if (_serviceStatus!= value)
                {
                    _serviceStatus= value;
                    RaisePropertyChanged("ServiceStatus");
                }
            }
        }

public void TestMethod()
{
  ServiceStatus.Add("TEST MESSAGE");
}

#region INotifyPropertyChanged Interface
        public event PropertyChangedEventHandler PropertyChanged;
        protected virtual void RaisePropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }
        #endregion
}