Popup menu on ToolWindow

I try to get a  popup menu on my own tool window, expecting behaviour similar to ‘Projet’ tool window

Here is my piece of code using setTitleActions

...
toolWindow.setStripeTitle("Categories");

AnAction anAction = new MyAction(toolWindow);
anAction.getTemplatePresentation().setIcon(AllIcons.General.Combo2);
((ToolWindowEx) toolWindow).setTitleActions(new AnAction[]{anAction});


and MyAction class

public void actionPerformed(AnActionEvent aae) {

  DefaultActionGroup actionGroup = new DefaultActionGroup();
  actionGroup.add(new DoSomething("C1"));
  actionGroup.add(new DoSomething("C2"));
  actionGroup.add(new DoSomething("C3"));
  
  ActionPopupMenu actionPopupMenu =
    ActionManager.getInstance().createActionPopupMenu(null,actionGroup) ;

  
  ToolWindow toolWindow =
    ToolWindowManager.getInstance(aae.getProject())
      .getToolWindow(TOOL_WINDOW_ID) ;
  actionPopupMenu.getComponent().show(
    toolWindow.getComponent().getComponent(0), 0, 0); // toolWindow is composed of only one Jpanel
}

I got something working, nevertheless I have some questions:
- Do I am on the right track for such feature ?
- The only clikable part is the Combo2 icon, how to get a wider clickable area (as done on project tool window where 'Project text' is also clickable)  ?
- For now, the text "Categories" is set on left side and the Combo2 icon is stick on right side, How to put Combo2 icon close to text "Categories" ?
- Must I take care of the fact that a new ActionPopupMenu is created on each invocation of actionPerformed  (memory leak ) ?

Thanks for the tips

Bernard