If i even move code and finalize it by this way:


Qt Code: 
  1. void MainWindow::on_actionOptions_toggled(bool n)
  2. {
  3.     if(n)  // hiding or showing widgets by menu
  4.         ui->dockWidget_2->show();
  5.     else ui->dockWidget_2->hide();
  6. }
  7.  
  8. void MainWindow::on_actionGraph_Options_toggled(bool n)
  9. {
  10.     if(n)  // hiding or showing widgets by menu
  11.         ui->dockWidget->show();
  12.     else ui->dockWidget->hide();
  13. }
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It does not change anything. Still the same problems.