...change the TreeView item height?

{ .... }

uses CommCtrl;

{ .... }

procedure SetTreeViewItemHeight(aTreeView: TTreeView; aItemHeight: Word);
begin
  aTreeView.Perform(TVM_SETITEMHEIGHT, aItemHeight, 0);
end;


// Example:
procedure TForm1.Button1Click(Sender: TObject);
begin
  SetTreeViewItemHeight(TreeView1, 30);
end;

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