in the end i used this code
VB.NET Code:
  1. Private Declare Sub mouse_event Lib "user32.dll" (ByVal dwFlags As Integer, ByVal dx As Integer, ByVal dy As Integer, ByVal cButtons As Integer, ByVal dwExtraInfo As IntPtr)
  2.     Const MOUSEEVENTF_LEFTDOWN As Integer = 2
  3.     Const MOUSEEVENTF_LEFTUP As Integer = 4
  4.     Const MOUSEEVENTF_RIGHTDOWN As Integer = 6
  5.     Const MOUSEEVENTF_RIGHTUP As Integer = 8
  6.  
  7.  
  8.     mouse_event(MOUSEEVENTF_LEFTDOWN + MOUSEEVENTF_LEFTUP, 0, 0, 0, IntPtr.Zero)