How to deselect an item give the model's id in a treepanel?

[zhenrong]

Hi,

Given the id of a model, how can I deselect it in a treepanel (bound to a tree store)? I am stucked at this line in my controller:

this.getMyItemsTree().getSelectionModel().deselect();

The deselect method asked for a argument of array Ext.data.model[] or index. But what i do have is its id of the model.

Any help is appreciated. Thanks!