As workarond I have set up two text fields:
<TextBox Name="LegendBoxVisibilityDummyTextBox" Text="{Binding Path=LegendBoxVisibility, Mode=OneWay}" Visibility="Collapsed"></TextBox>
<TextBox Name="PointLabelAttributesVisibilityDummyTextBox" Text="{Binding Path=PointLabelAttributesVisibility, Mode=OneWay}" Visibility="Collapsed"></TextBox>And the this binding for the legend box visibility:
<
cfx:LegendBox cfx:Chart.TargetPanel="Inside" HorizontalAlignment="Right" VerticalAlignment="Top" Visibility="{Binding Path=Text, ElementName=LegendBoxVisibilityDummyTextBox, Mode=OneWay}">This seems to work as woraround. I have tried the same for the point labels but it does NOT work:
<
cfx:PointLabelAttributes Visibility="{Binding Path=Text, ElementName=PointLabelAttributesVisibilityDummyTextBox, Mode=OneWay}">