code: private void jCheckBoxDrawMarkersActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jCheckBoxDrawMarkersActionPerformed
          if (jCheckBoxDrawMarkers.isSelected())
              parent.getGraphPanelChart().getChartSettings().setChartMarkers(ChartSettings.CHART_MARKERS_YES);
          else parent.getGraphPanelChart().getChartSettings().setChartMarkers(ChartSettings.CHART_MARKERS_NO);
          refreshGraphPreview();
      }
docs: GEN-LAST:event_jComboBoxChartTypeActionPerformed