As already mentioned in my previous post, RadTimeline for Sliverlight does not support automatically calculated height, based on the number of its rows of items. That is why, I suppose you have wrapped the timeline control in a Vertical StackPanel and have not specified concrete Height. Please correct me if I am wrong. In this case, the control might behave in this manner. However, please note that this scenario is not supported. I will forward your case to our developers for consideration.
I created a simple page that demonstrates a workaround that might work for you. Please note, that as this is not a supported scenario, you need to test this workaround thoroughly in order to make sure that it indeed works for your particular case.
TRY TELERIK'S NEWEST PRODUCT - EQATEC APPLICATION ANALYTICS for SILVERLIGHT.
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