Put Rectangle into TextBlock
<Page x:Class="WpfApplication1.Page1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Page1"> <Grid> <Button Height="23" Margin="12,12,0,0" Name="button1" VerticalAlignment="Top" HorizontalAlignment="Left" Width="76" Click="button1_Click">Button</Button> <TextBlock FontSize="16" Name="textBlock1" VerticalAlignment="Center" HorizontalAlignment="Center" xml:space="preserve"><Bold>Goodbye</Bold> world, <Rectangle Width="20" Height="20" Fill="Blue"/> hello <Italic>Mars!</Italic></TextBlock> </Grid> </Page> //File:Window.xaml.vb Imports System Imports System.Collections.Generic Imports System.Linq Imports System.Text Imports System.Windows Imports System.Windows.Controls Imports System.Windows.Data Imports System.Windows.Documents Imports System.Windows.Input Imports System.Windows.Media Imports System.Windows.Media.Imaging Imports System.Windows.Navigation Imports System.Windows.Shapes Namespace WpfApplication1 Public Partial Class Page1 Inherits Page Public Sub New() InitializeComponent() End Sub Private Sub button1_Click(sender As Object, e As RoutedEventArgs) MessageBox.Show("Please dont click this button again") End Sub End Class End Namespace