WPF

<UserControl x:Class="MyChart.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="350" d:DesignWidth="529"
             xmlns:toolkit="http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit" Loaded="UserControl_Loaded" xmlns:my="clr-namespace:MyChart">

    <Grid x:Name="LayoutRoot" Background="White" Height="332" Width="547">
        <Button Content="Display Chart" Height="38" HorizontalAlignment="Left" Margin="203,173,0,0" Name="btnDisplayChart" VerticalAlignment="Top" Width="113" Click="btnDisplayChart_Click" />
        <ComboBox Height="38" HorizontalAlignment="Left" Margin="157,99,0,0" Name="comboBox1" VerticalAlignment="Top" Width="198">
            <ComboBoxItem Content="Column Chart" IsSelected="True" />
            <ComboBoxItem Content="Bar Chart" />
            <ComboBoxItem Content="Pie Chart" />
        </ComboBox>
    </Grid>
</UserControl>

string wordToSearch = "word";
 
TextRange tr = new TextRange(this.rtb.Document.ContentStart, 
 
int startPos = tr.Text.IndexOf(wordToSearch);
 
this.rtb.Document.ContentEnd);
                        
                       
if (startPos > -1)
{
   int l = this.GetLinesCount(tr.Text, startPosition);
   
  TextPointer startRtb = this.rtb.Document.ContentStart;
  TextPointer start = startRtb.GetPositionAtOffset(startPos + l);
  TextPointer end = start.GetPositionAtOffset(wordToSearch.Length);
  
  this.rtb.Selection.Select(start, end);  
  this.rtb.Selection.ApplyPropertyValue(
                                TextElement.BackgroundProperty, 
                                this.rtb.SelectionBrush);
}
 
public int GetLinesCount(string str, int startPosition)
{
    int lines = str.Take(startPosition).Count(k => 
                k.Equals((char)13) || k.Equals((char)10));
    return lines + 2;
}

private ICommand _SelectedLinkCommand;
public ICommand SelectedLinkCommand
{
    get
    {
        if (_SelectedLinkCommand == null)
            _SelectedLinkCommand = new RelayCommand(SelectedLinkExecuted, SelectedLinkCanExecute);
        return _SelectedLinkCommand;
    }
}

private bool SelectedLinkCanExecute()
{
    return fileSelected;
}
private void SelectedLinkExecuted()
{
    // Handle the link click here
}

<HierarchicalDataTemplate DataType="{x:Type models:NodeModel}"
                            ItemsSource="{Binding Path=Children}">
    <StackPanel Orientation="Horizontal"
                Margin="2">

        <TextBlock Margin="0,0,5,0">
            <Hyperlink NavigateUri="{Binding Caption}"
                        Foreground="#0C2DAA"
                        Command="{Binding SelectedLinkCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={ x:Type }}}">