In my pie chart the texts on the legend are editable. In the Future Browser you can see this situation easily.

xamChart->Chart Types Gallery->Light 3D-> You can change "Belarus", "Greece" ....

I do not want them editable.

I put IsReadoly Property to that style, works great. Thank you very much.

The legend text is by default not editable, but I'm guessing you've applied the styles/templates from the sample that you referenced:

<DataTemplate DataType="{x:Type igCA:LegendItemTemplate}">
    <Grid Background="{x:Null}" Margin="0,0,0,0"  Width="Auto" Height="Auto">
      <Viewbox HorizontalAlignment="Left" MaxHeight="20" VerticalAlignment="Stretch" Stretch="Uniform">
        <StackPanel Orientation="Horizontal" Width="Auto" Height="Auto">
          <Grid Width="Auto">
            <Ellipse
    					Fill="{Binding Path=Fill}"
    					Width="11"
    					Height="11"
    					StrokeThickness="1"
      			/>
          </Grid>
          <TextBox Text="{Binding Path=Text}" VerticalAlignment="Bottom" HorizontalAlignment="Left"  Background="{x:Null}" BorderBrush="{x:Null}"  Margin="3,0,0,0" BorderThickness="0,0,0,0"/>
        </StackPanel>
      </Viewbox>
    </Grid>
  </DataTemplate>

Which uses a Textbox to display the legend item content. You should be able to shift this to be a TextBlock instead and the text will stop being editable. Or, if you still want to be able to select the legend item text you could just set IsReadOnly to true on the TextBox in the data template above.

-Graham