How to open from a Particular Folder using FolderBrowser Dialog

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C#3.0

C#

Hi,
How to open from a Particular Folder using FolderBrowser Dialog ?

using (FolderBrowserDialog folderBrowser = new FolderBrowserDialog())
               {

folderBrowser.RootFolder = Environment.SpecialFolder.MyDocuments;

folderBrowser.SelectedPath = "C:\Users\XYZ\Documents\Root\Parent\Child\";
                       folderBrowser.ShowNewFolderButton = false;

My path is C:\Users\XYZ\Documents\Root\Parent\Child\

Child folders has 5 sub folders .
So it should open from Child Folder

But it it scrolled till Child folder ,ideally the child folder should expand in the Dialog Window.
not working any Idea Please!

with regards,
Rohit