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（本文来源于图老师网站，更多请访问http://m.tulaoshi.com/bianchengyuyan/）下面的代码可以让Treeview前面显示CheckBox.
const
TVS_CHECKBOXES = $00000100;
procedure SetComCtrlStyle(WinCtrl: TWinControl; Value: Integer; UseStyle: Boolean);
var
Style: Integer;
begin
if WinCtrl.HandleAllocated then
begin
Style := GetWindowLong(WinCtrl.Handle, GWL_STYLE);
if not UseStyle then
Style := Style and not Value
else Style := Style or Value;
SetWindowLong(WinCtrl.Handle, GWL_STYLE, Style);
end;
end;
（本文来源于图老师网站，更多请访问http://m.tulaoshi.com/bianchengyuyan/）然后 在 OnCreate 调用：
SetComCtrlStyle(TreeView1, TVS_CHECKBOXES, True);
或者干脆简单点，一句话完事：
SetWindowLong(TreeView1.Handle, GWL_STYLE, GetWindowLong(TreeView1.Handle, GWL_STYLE) or $00000100);
