how do we double click the node of treeview programmatically?

I made the editable column of the treeview. So when we double click it,
it will select all the text of the node, then we can edit the node. How
do I achieve that but not using double click, but function. So for the
example, when I click the certain button, it will get same effect when
we just double click of the node.

Thank you.

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