code: private void jCheckBoxUseDefaultActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jCheckBoxUseDefaultActionPerformed
          
      	if(jCheckBoxUseDefault.isSelected()){
      		pref.put(DisposableOBDAPreferences.USE_DEAFAULT, "true");
      		cmdFontFamily.setEnabled(false);
      	}else{
      		pref.put(DisposableOBDAPreferences.USE_DEAFAULT, "false");
      		cmdFontFamily.setEnabled(true);
      	}
      	
      }
docs: GEN-LAST:event_cmdFontFamilyActionPerformed