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caching images on treegrid

How do I cached images on treegrid more effectively?

I have an issue with the treegrid during loading of images. My treegrid has around 5000 to 10000 rows with 6 columnns and each of these columns has an image on it.During expandall or during load, the images takes a while to render and loads on a per row basis. Sometimes it will load the images on the first 3 rows and if you slowly scroll the treegrid scrollbar it will slowly (very slowly) load the rest. The images that loads slowly are the regular images of a treegrid (collapse and expand icons, folder and document icon) and my custom images which are pretty small (same size as the folder and document icon). I only have 4 custom images by the way and each cell of my grid correspond to a custom image.

Are these images cached automatically by the treegrid? If not, how can I cached so as not to affect user experience?

I am using the pro version of the treegrid. Version 1.6 build 80512. If there is a latest build, please also email me one. I will email our reference id if asked.

Thanks in advanced!

Grid has not any special cache for images, but in normal case they cached browser. 
Please be sure that server provides all necessary headers to force image caching. 
If problem occurs for IE only - issue can be caused by known bugs in IE image caching routine ( which ignores dynamically created images )
If you are using inline img tags, you can replace them with DIV's with background image - IE will cache such images correctly.