Mouse formdan dışarı çıkamaz

Private Type RECT
left As Long
top As Long
right As Long
bottom As Long
End Type
Private Type POINT
x As Long
y As Long
End Type
Private Declare Sub ClipCursor Lib "user32" (lpRect As Any)
Private Declare Sub GetClientRect Lib "user32" (ByVal hWnd As Long, lpRect As RECT)
Private Declare Sub ClientToScreen Lib "user32" (ByVal hWnd As Long, lpPoint As POINT)
Private Declare Sub OffsetRect Lib "user32" (lpRect As RECT, ByVal x As Long, ByVal y As Long)
Private Sub Command1_Click()
Dim client As RECT
Dim upperleft As POINT
GetClientRect Me.hWnd, client
upperleft.x = client.left
upperleft.y = client.top
ClientToScreen Me.hWnd, upperleft
OffsetRect client, upperleft.x, upperleft.y
ClipCursor client
End Sub

Private Sub Command2_Click()
ClipCursor ByVal 0&
End Sub
Private Sub Form_Load()
Command1.Caption = "Mause sınırla"
Command2.Caption = "Serbest bırak"
End Sub
Private Sub Form_Unload(Cancel As Integer)
ClipCursor ByVal 0&
End Sub