I am using Nevron Charts hosted in WindowsFormsHost in WPF.

Normally this works fine but in a modal dialog the Nevron Chart stops the correct rendering of the surrounding wpf controls.
We have several examples of this happening, not just related to a single form.

We are currently using .net 4.0 although this behaviour was also present in .net 3.5sp1.

Currently on Nevron 2008 Q3.

Is this a known issue, and if so, is it fixed in a newer version of Nevron Chart?

Attached are screenshots of the page in question rendered badly (looks like animation has halted 1 frame early)
and the page rendered correctly, which can be achieved either by dragging the window off the screen and back or by altering the window size.

thanks