public PropertiesFile getPropertiesFile() {
    Object selectedItem = myPropertiesFile.getSelectedItem();
    if (selectedItem == null) return null;
    String path = FileUtil.toSystemIndependentName((String)selectedItem);
    VirtualFile virtualFile = LocalFileSystem.getInstance().findFileByPath(path);
    return virtualFile != null
           ? PropertiesImplUtil.getPropertiesFile(PsiManager.getInstance(myProject).findFile(virtualFile))
           : null;
  }
public PropertiesFile getPropertiesFile()