Collapses all groups of the navbar.
Use the CollapseAll method to collapse all groups within the navbar on the client side.
Note that a call to this method collapses the expanded groups even if the navbar's ASPxNavBar.AllowExpanding (or a group's NavBarGroup.AllowExpanding) property is set to false. A call to the CollapseAll method does not generate a sequence of the ASPxClientNavBar.ExpandedChanging and ASPxClientNavBar.ExpandedChanged events.
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