static void OverrideRemoveChild(GLib.GType gtype, RemoveChildNativeDelegate callback)
 {
     unsafe {
         IntPtr *raw_ptr = (IntPtr *)(((long)gtype.GetClassPtr()) + (long)class_abi.GetFieldOffset("remove_child"));
         *raw_ptr = Marshal.GetFunctionPointerForDelegate((Delegate)callback);
     }
 }
        private bool InternalRemoveChild(GES.TimelineElement element)
        {
            RemoveChildNativeDelegate unmanaged = null;

            unsafe {
                IntPtr *raw_ptr = (IntPtr *)(((long)this.LookupGType().GetThresholdType().GetClassPtr()) + (long)class_abi.GetFieldOffset("remove_child"));
                unmanaged = (RemoveChildNativeDelegate)Marshal.GetDelegateForFunctionPointer(*raw_ptr, typeof(RemoveChildNativeDelegate));
            }
            if (unmanaged == null)
            {
                return(false);
            }

            bool __result = unmanaged(this.Handle, element == null ? IntPtr.Zero : element.Handle);

            return(__result);
        }