With this modification i have another problem…

When the page load the only row visible is ID 1 – Root

if I click on it the treegrid load the first level under root but Root itself disappear…

See the image…after the click on the Root Node

If I click Refresh when the treegrid is open the initial status is reloaded (Only Root node visible)… is this the way it is intended to work?

If I click refresh I go back to the initial status? The entire tree collapsed?

Is there a way to do a refresh and leave the current status of opened branches?