From what I see on the image attached (area series) you populated the Chart with 4 area series but they are overlapping one another so that only 2 of them are visible. Since you have turned on the visibility for all series labels, you are observing this unwanted label overlapping. Are you sure that you need such visualization? Why don't you add 2 are series only?
The stacked area series use different visualization strategy as you might read about here.
Still if you need to visualize all the 4 series of your stacked area with their labels, you might use our smart labels feature as demonstrated here with full source code provided. You'll find further details on the feature in our documentation.
TRY TELERIK'S NEWEST PRODUCT - EQATEC APPLICATION ANALYTICS for SILVERLIGHT.
Learn what features your users use (or don't use) in your application. Know your audience. Target it better. Develop wisely.
Sign up for Free application insights >>