Use label instead of text block will work for you
Click="ButtonClickHandler" Height="36" > <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="30"/> <ColumnDefinition Width="70"/> </Grid.ColumnDefinitions> <Image Grid.Column="0" VerticalAlignment="Center" Margin="2"/> <Label Content="_Print" Grid.Column="1" Foreground="DarkBlue" VerticalAlignment="Center" Margin="2" /> </Grid> </Button>