legends size

How can I change font size and marker size in legend? I looked in SampleExplorer but I don't find how is it. Thanks for your all answers!

Understandable, it happens to be hidden away inside the SampleExplorer's App.xaml. To set it for your own page, your xaml could look something like this:

Inside the page's ResourceDictionary-

<DataTemplate x:Key="LargeItemTemplate">
    <StackPanel Orientation="Horizontal" Margin="6,0,6,0">
        <Border Width="20" Height="20" VerticalAlignment="Center" Background="{Binding LegendIconBrush}" Margin="0,2,0,0" />
        <TextBlock Text="{Binding LegendLabel}" FontFamily="Segoe UI" FontSize="18" Margin="7,0,0,0" />
    </StackPanel>
</DataTemplate>

<Style x:Key="MyLegendStyle" TargetType="ch:Legend">
    <Setter Property="ItemTemplate" Value="{StaticResource LargeItemTemplate}" />
</Style>

On the chart-

<ms:Chart LegendStyle="{StaticResource MyLegendStyle}">

The DataTemplate above will give you the look shown throughout the SampleExplorer, but tweaking the FontSize and Border Width/Height will allow you to customize it how you want. You could of course replace the Border (and text) with whatever objects you'd like (ie a Path). Hope this helps; any more questions feel free to ask.

Thanks, it works.