/** Cacluates logical position of x,y pixel values, but does not set the pos variable */
 private int calculatePosition(int x, int y) {
   int row = baseEditorPanel.getRowForPixelPosition(y);
   int col = baseEditorPanel.getColForPixelPosition(x);
   // getColumnCount from super class SeqAlignPanel
   return (baseEditorPanel.getColumnCount() * row) + col;
 }