Dhtmlxtree has a compatible problem when i using IE7

dhtmlx.com/docs/products/dht … o_ltr.html
when i use the tree on IE7 ,the tree sometimes move up and down.
but it doesn’t happen on another browers.
if anyone know how to solve it.

Please provide exact steps, that can be used to reconstruct the issue

using IE7,
Open this link dhtmlx.com/docs/products/dht … o_ltr.html
click the Mystery & Thrillers Node,then click any of its child Node for example Ian Rankin
a last click the Mystery & Thrillers Node again.you will see the tree move down .

Issue may be related to the build of IE and OS - as it doesn’t occur while repeating the same steps from out side.

Which version of IE you are using ? Is it a native IE or some IE testing tool ? What is the OS version ?

it is IE8.0.6001.18702
the issue happens when i using the IE developer tools to change it to IE 7 mode.
OS Microsoft Windows XP Professional Service Pack3