Swing shielding of components

In project , SWING#JCOMBO and SWT的browser，priority of JCOMBO is lower than priority of browser, so the item in drop list is shielded. Solution is to use index to set the level of components.

      m_pane.add(super.getPane(), "0,4,10,4", 6);
      m_pane.add(getFilterCB(), "10,2", 0);