Silverlight UI Virtualisation for Listbox with Items having writable bitmap

I have a created a display control with two Columns - 1. A thumbails list and 2. Listbox of images. The images are written to writeable bitmap and then added to listbox items.

I have created custom tab control so that multiple instances can be opened. The issue here is with multiple tabs o开发者_JAVA百科pen, the memory usage shoots upto 1.2GB.

Is the list box by itself use ui virtualisation?

Want to know if there are any better solutions for this.