Sheet sheet = ss.getSelectedSheet();
MergeMatrixHelper mmhelper = ((SpreadsheetCtrl)ss.getExtraCtrl()).getMergeMatrixHelper(sheet);
List blocks = mmhelper.getRangesByColumn(max);
Iterator iter = blocks.iterator();
while(iter.hasNext()){
Rect rect = (Rect)iter.next();
int top = rect.getTop();
//int left = rect.getLeft();
int right = rect.getRight();
//int bottom = rect.getBottom();
if(top<row_top || top<row_bottom){
continue;
}