Drill down options

I'm fairly new to the Xcelsius product so I may just be missing something obvious...

I have a stacked bar chart with 3 columns (the stack is just 2 series) and what I want to have happen is when a user clicks on any part of the column, a drill down to another chart appears as an overlay on another part of the screen. But I have two problems

The drill-down options require me to select a value/range for each series - and won't let me use the same one for both. Regardless of which part of the column they click on, I want to display the same drill-down chart....

I have to specify one of the charts as a default - which means it appears as soon as the SWF is opened. I have the object hidden and tried pre-setting all the display values to 0 but one of the charts (one for each of the main columns) always has to be select as the default. I would like one of the drill down charts to show as an overlay ONLY when the relevant column in the main chart is clicked...

Are the above design features/flaws or is there a way to do what I want to do?

I appreciate any help you can give...:-)