private enum RedrawWindowFlags : uint

    /// <summary>Causes the affected windows, which you specify by setting the RDW_ALLCHILDREN and RDW_NOCHILDREN values, to receive WM_ERASEBKGND and WM_PAINT messages before the RedrawWindow returns, if necessary.</summary>

    /// Causes the affected windows, which you specify by setting the RDW_ALLCHILDREN and RDW_NOCHILDREN values, to receive WM_ERASEBKGND messages before RedrawWindow returns, if necessary.

Private Enum RedrawWindowFlags As UInteger

    ''' <summary>Causes the affected windows, which you specify by setting the RDW_ALLCHILDREN and RDW_NOCHILDREN values, to receive WM_ERASEBKGND and WM_PAINT messages before the RedrawWindow returns, if necessary.</summary>

    ''' Causes the affected windows, which you specify by setting the RDW_ALLCHILDREN and RDW_NOCHILDREN values, to receive WM_ERASEBKGND messages before RedrawWindow returns, if necessary.

    /// The WM_PAINT message is sent when the system or another application makes a request to paint a portion of an application's window. The message is sent when the UpdateWindow or RedrawWindow function is called, or by the DispatchMessage function when the application obtains a WM_PAINT message by using the GetMessage or PeekMessage function.

static extern bool RedrawWindow(IntPtr hWnd, [In] ref RECT lprcUpdate, IntPtr hrgnUpdate, RedrawWindowFlags flags);

static extern bool RedrawWindow(IntPtr hWnd, IntPtr lprcUpdate, IntPtr hrgnUpdate, RedrawWindowFlags flags);

Private Shared Function RedrawWindow(hWnd As IntPtr, <[In]> ByRef lprcUpdate As RECT, hrgnUpdate As IntPtr, flags As RedrawWindowFlags) As Boolean

Private Shared Function RedrawWindow(hWnd As IntPtr, lprcUpdate As IntPtr, hrgnUpdate As IntPtr, flags As RedrawWindowFlags) As Boolean

RECT, RedrawWindowFlags

        WinAPI.RedrawWindow(this.Handle, IntPtr.Zero, IntPtr.Zero,