treeview update

I am trying to create a treeview in which each node has a check box
and in the front of each node I would like to draw a box (a
rectangulare box) which lets me click on and change the colour
property of things which are related to the node. I have managed to
make the checkbox, and rectangulare in the front of node, but when I
change the property of one of the rectangular, every property of other
rectangular will change to the new change. Is there a way I can create
individule boxes for each node, which can be separated from each
other?