.Net WinForms当具有AllowTransparency = true时，使用SendMessage（... WM_SETREDRAW ..）暂停表单布局的意外行为，隐藏了表单

Question

具有以下形式：

Me.AllowTransparency = True
Me.BackColor = Color.Magenta
Me.TransparencyKey = Me.BackColor

并且正在做

SendMessage(pForm.Handle, WM_SETREDRAW, New IntPtr(CInt(False)), IntPtr.Zero)

隐藏表格，没有透明效果，效果很好……

有解决方法吗？真正暂停布局的另一种方法？

定义：

Private Const WM_SETREDRAW As Int32 = &HB
Private Declare Auto Function SendMessage Lib "user32.dll" (ByVal hWnd As IntPtr, ByVal wMsg As Int32, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As IntPtr

使用Win10（1803）。