treeview asp.net 2.0 question

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I have a treeView menu on my master page and I have a few questions on it

1) how can I get the menu to stay expanded when a user selects a child node
and not flicker the page?
2) how can I have the selected node highlighted?
3) when a node does not have a child node, can I removed the arrow to the
left of the parent node? I only want parent nodes with children to have an
indicator.

thanks