How do you clear out a tree control?

I am editing items in a tree control, when the editing is complete, I re-build the tree to represent what I have after the edit.  My process of deleting the items one-by-one has worked fine until the tree scrolled off the top, then, when I select the top-left item and delete everything under it, I miss the ones that have scrolled off the top.
What's the method/property I should use to clean out a tree in one operation?  (before rebuilding)
   ...Dan

  Tray Drool!
Originally I had, "How do you clear out a tree?".  That's why I added "control".

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