private boolean canDragCell(final int cell) {
      if (mySelectedContainer == null) return false;
      for(RadComponent c: mySelectedContainer.getComponents()) {
        if (c.getConstraints().contains(myIsRow, cell) && c.getConstraints().getSpan(myIsRow) > 1) {
          return false;
        }
      }
      return true;
    }
private boolean canDragCell(final int cell)