I thought this might be a frequent question and walked around
your FAQ's and forums, but couldn't find out the answer.
So I am happy if you tell me how to...
Q1. Trigger loading mts or jpeg file when click an object.
Our mts file is already bit too fat. So we don't want to
load all of them at once. We devided the data to 2 mts files
and one is defined as follows.

What I want to do is turn the "On" option to "1" and load
the extra mts file.
Q2. Turn the Collapsed option off when click an object.
As I wrote, our data is rather heavy now. So we don't want
to send all the data to VMP graphic routine. We defined part
of the objects with the collapsed option "1" as below.

But when certain object is clicked, we want to turn the
option to "0" and make it visible.
I am happy if someone has sample xml files for my questions.
Thank you.

Dear Tetsu,

Someone else posted an almost identical question today on the Tips, Tricks and Hacks forum. It's easy to do what you want- just remember to reference the on-click to the correct instance. I've attached a file here. You can use the same MTSStream tag for textures also, although you have to change the type (Texture) and target appropriately. ~Chris