SetFocus(child_window->Window.Handle);
SetActiveWindow( child_window->Window.Handle );
INVOKE_WCB( *child_window, Entry, ( GLUT_ENTERED ) );
SetFocus(child_window->Window.Handle);
SetActiveWindow( child_window->Window.Handle );
INVOKE_WCB( *child_window, Entry, ( GLUT_ENTERED ) );