code: public boolean isParamPanelSelected(String panelName) {
          DefaultMutableTreeNode node = getTreeNodeFromPanelName(panelName);
          if (node != null) {
              return getTreeParam().isPathSelected(new TreePath(node.getPath()));
          }
          return false;
      }
docs: Tells whether or not the given param panel is selected.
  
  @param panelName the name of the panel to check if it is selected, should not be {@code null}.
  @return {@code true} if the panel is selected, {@code false} otherwise.
  @since TODO add version
  @see #isParamPanelOrChildSelected(String)