Memory leaks when rendering PolygonFeatures

[matd]

I'm writing a plugin in C# that attempts to draw a large number of rectangles as PolygonFeatures. I have a thread that processes the packets of information via a socket where the data is decoded and drawn.

I use this data to create the placements for my rectangles and add them to a RenderableObjectList. Periodically, I need to clear the screen of these rectangle entities and I am trying to do so by .RemoveAll on the RenderableObjectList.

The entities clear the display, but I notice I am hemmoraging memory over time, actually quite quickly. I've taken care to .Dispose of objects in between that I no longer need but it hasn't helped. In fact, if I just comment out the single line of code where I added the PolygonFeature to the RenderableObjectList, I don't get a memory leak so I am certain it's not happening in a cursory part of the code.

[matd]

Some more information -

I am drawing PolygonFeatures, ModelFeatures and LineFeatures on the map as my entities. I noticed the ModelFeature entities also leak memory like the aforementioned problem. However, the LineFeatures do not, they are very stable with memory usage.

I took a look at the Dispose() method for each of these object types and noticed LineFeature sets a NeedsUpdate flag at Dispose time, and the other two object types do not (hence, they do not call the private Update method at Dispose time).