code: protected void updateOverwriteExisting() {
  
          if (m_overwriteExisting != null) {
              boolean move = (m_dialogMode == DialogMode.move) || (m_actionCombo.getValue() == Action.move);
              if (move) {
                  m_overwriteExisting.setValue(Boolean.FALSE);
                  m_overwriteExisting.setVisible(false);
              } else {
                  m_overwriteExisting.setVisible(true);
              }
          }
      }
docs: Updates the 'overwrite existing' checkbox state depending on the currently selected mode.<p>