"loss of data due to type conversion" using EventChartCustom

//--- Check the event by pressing a mouse button
   if(id==CHARTEVENT_OBJECT_CLICK)
     {
      string clickedChartObject=sparam;
      //--- If you click on the object with the name buttonID
      if(clickedChartObject==buttonID)
        {
         //--- State of the button - pressed or not
         bool selected=ObjectGetInteger(0,buttonID,OBJPROP_STATE);
         //--- log a debug message
         Print("Button pressed = ",selected);
         int customEventID; // Number of the custom event to send
         string message;    // Message to be sent in the event
         //--- If the button is pressed
         if(selected)
           {
            message="Button pressed";
            customEventID=CHARTEVENT_CUSTOM+1;
           }
         else // Button is not pressed
           {
            message="Button in not pressed";
            customEventID=CHARTEVENT_CUSTOM+999;
           }
         //--- Send a custom event "our" chart
         EventChartCustom(0,customEventID-CHARTEVENT_CUSTOM,0,0,message);
         //(0, IntegerToString(customEventID,0, ' '));
         //(0,customEventID-CHARTEVENT_CUSTOM,0,0,message);
         ///--- Send a message to all open charts
         BroadcastEvent(ChartID(),0,"Broadcast Message");
         //--- Debug message
         Print("Sent an event with ID = ",customEventID);
        }
      ChartRedraw();// Forced redraw all chart objects
     }

int customEventID; // Declared as a standard integer.
// ...
if(selected)
{
    customEventID=CHARTEVENT_CUSTOM+1;
}
else
{
    customEventID=CHARTEVENT_CUSTOM+999;
}
EventChartCustom(0,customEventID-CHARTEVENT_CUSTOM,0,0,message); // Unsafe conversion

ushort user_event_id; // Correct data type 'ushort' is used.
// ...
if(selected)
{
    user_event_id = 1; // Assign the direct user portion of the ID.
}
else
{
    user_event_id = 999; // Assign the direct user portion of the ID.
}
EventChartCustom(0, user_event_id, 0, 0, message); // Type-safe call.

if(id == CHARTEVENT_OBJECT_CLICK)
{
    string clickedChartObject = sparam;
    if(clickedChartObject == buttonID)
    {
        bool selected = (bool)ObjectGetInteger(0, buttonID, OBJPROP_STATE);
        Print("Button state changed. Pressed = ", selected);
        ushort user_event_id;
        string message;
        if(selected)
        {
            message = "Button pressed";
            user_event_id = 1;
        }
        else
        {
            message = "Button is not pressed";
            user_event_id = 999;
        }
        EventChartCustom(0, user_event_id, 0, 0, message);
        BroadcastEvent(ChartID(), 0, "Broadcast Message");
        Print("Sent a custom event with user ID = ", user_event_id, ". Full event ID = ", CHARTEVENT_CUSTOM + user_event_id);
    }
    ChartRedraw();
}