I wish I knew this one sooner! If yo'uve worked with TTreeView before, and know about TTreeNode's HasChildren value, you need to check with OnExpanding, if you need to load the children or not. So I would typically have something like this:
if Node.HasChildren and (Node.Count=0) then //load children nodes Only now after all these years I happen to come past this in the
Vcl.ComCtrls.pas
unit:
function TTreeNode.GetCount:
Integer;
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