TGtk2WidgetSet.SetAppActive Seems work crazy

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Hi
If you know Conky(system monitor) on linux this application will alive and visible even it's application/process run into deactivated!
I have same view in Conky,  A visible window to monitor somthing, and there is some setting forms.
But in my case Everything will disappeared on one of other forms show/hide.
Tracing codes get me in TGtk2WidgetSet.SetAppActive place!
The question: Why when application run into deactivate, Application tries to AppRemoveStayOnTopFlags?
In other words, What is means of StayOnTop? It must keep visible and stayontop out of Application scop.

Code: Pascal  [Select][+][-]

1. procedure TGtk2WidgetSet.SetAppActive(const AValue: Boolean);
2. begin
3.   if AValue <> FAppActive then
4.   begin
5.     FAppActive := AValue;
6.     if FAppActive then
7.     begin
8.       Application.IntfAppActivate;
9.       AppRestoreStayOnTopFlags(False);
10.     end else
11.     begin
12.       Application.IntfAppDeactivate;
13.       AppRemoveStayOnTopFlags(False); //[b]<<==Here is the question[/b]
14.     end;
15.   end;
16. end;
17.  

I have commented that line and it seems work fine, However I didn't check if something goes wrong!