code: private  void initialize() {
  		historyListFiltersButtonGroup = new DeselectableButtonGroup();
  
  		this.setLayout(new BorderLayout());
  	    if (Model.getSingleton().getOptionsParam().getViewParam().getWmUiHandlingOption() == 0) {
  	    	this.setSize(600, 200);
  	    }
  		this.add(getHistoryPanel(), java.awt.BorderLayout.CENTER);
  		
  		this.setDefaultAccelerator(view.getMenuShortcutKeyStroke(KeyEvent.VK_H, KeyEvent.SHIFT_DOWN_MASK, false));
  		this.setMnemonic(Constant.messages.getChar("history.panel.mnemonic"));
  		
  	}
docs: This method initializes this