Using pre-set substitution variables for drill down
There are some hidden variables that are always set when you perform a drilldown. These are useful if you want to know which column or cell was selected to perform the drilldown:
$celldata: Set to the value of the cell selected.
$colName: Set to the name of the column of the cell.
You can use these variables, for example, as parameters to functions or commands whose action you want to vary based on the column or cell value selected.