Collapse All Rows in Tree Table programmatically

Hi All,
I am using Jdev 11.1.5
I have a JSPX page with a Tree Table(one level deep) and a commandButton.
On click of the commandButton all the rows should be collpased.
It would be great if anyone could provide the code to be written in Managed Bean along with the properties to be set of respective components.
Thank You.

public void collapseAll(){
treeTable.getDisclosedRowKeys().clear();
public void onClick(ActionEvent actionEvent) {
// Add event code here...
this.collapseAll();
Also have set the partialSubmit of Button true.
partialTrigger of Table set to commandButton.
But this din't work..:(:(
where am i wrong.?

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