预设显示下拉三角形样式，需要设置TreeList的两个皮肤属性：
C# Code:
tree.LookAndFeel.UseDefaultLookAndFeel = false;
tree.LookAndFeel.UseWindowsXPTheme = true;
//来源:C/S框架网(www.csframework.com) QQ:1980854898
[DevExpress]TreeList显示[+] [-] 线条样式
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