With Nattable 1.1.0 i am able to use the ExpandAll and CollapseAll commands. Thanks. Also for the tree grid, is it possible to expand and collapse a single parent row? Lets say I have a tree grid with 10 top level rows (and each top row has nested sub rows with 3 or more child rows). I want to expand only row 3 programatically? Is there an option to do that? I am providing an option to expand and collapse all using context menus. There is also a requirement where for some rows i have to add option to expand that row alone.