internal CbtEventArgs(IntPtr wParam, IntPtr lParam)
{
// cache the parameters
this.wParam = wParam;
this.lParam = lParam;
// cache the window's class name
StringBuilder sb = new StringBuilder();
sb.Capacity = 256;
USER32.GetClassName(wParam, sb, 256);
className = sb.ToString();
IsDialog = (className == "#32770");
}