code: private void resetButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_resetButtonActionPerformed
          properties = new Hashtable<String,Object>();
          lookAndFeelComboBox.setSelectedItem(this.getDefaultText());
          sizeComboBox.setSelectedItem(this.getDefaultText());
          fontComboBox.setSelectedItem(this.getDefaultText());
          themeComboBox.setSelectedItem(this.getDefaultText());
  
          ScreenUtil.updateLookAndFeel(this, null, properties);
          this.setSampleStyle();
      }
docs: </editor-fold>//GEN-END:initComponents