(c++ builder) vcl函数和winAPI歧义，怎么解决

#include "winuser.h"[BCC32 Error] : E2015 Ambiguity between '__stdcall SetLayeredWindowAttributes(HWND__ *,unsigned long,unsigned char,unsigned long)' and 'Forms::SetLayeredWindowAttributes'这一句调用出现了歧义：SetLayeredWindowAttributes(Handle,0,50,LWA_ALPHA);Forms.SetLayeredWindowAttributes帮助:bool (__stdcall *)(unsigned int,unsigned int,unsigned char,unsigned int) SetLayeredWindowAttributes;API帮助：BOOL SetLayeredWindowAttributes( HWND hwnd, // 句柄 COLORREF crKey, //  颜色值 BYTE bAlpha, // 透明度DWORD dwFlags // 透明方式); 请问怎么才能制定使用前面的那个SetLayeredWindowAttributes呢？

::SetLayeredWindowAttributes 前面那个
this->SetLayeredWindowAttributes 后面那个
也许成功。

::setlayeredwindowattributes(handle,0,50,lwa_alpha);