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<telerik:SeriesMapping.SeriesDefinition> <telerik:LineSeriesDefinition AxisName="TempAxixYMain" ShowItemLabels="{Binding ElementName=chkDisplayValue,Path=isChecked}" ShowItemToolTips="True" x:Name="TempLine"> </telerik:LineSeriesDefinition> </telerik:SeriesMapping.SeriesDefinition>So i have to set the ShowItemLabels's value in the "checked" and "uncheck" events of checkbox