Hi Nikhil
The xlf you sent had one of the Pie charts as the most top component in the list and hence it was showing up. The order was not same as the screenshot.
Once I moved the combo-box to back it worked fine.
The Dynamic visibility makes a component inactive or active = not just visible to eye. So if you make it invisible it will not function too. So dont make the Combo boxes invisible. They need to stay visible when they need to work. So you have to use the chart's background or an actual background to hide it.
Why the grid helps - very strange I think it picks up the blank and inserts there again. Not sure. But Pie or any chart without the ability to bind the Item Selected - behaves this way - once you have clicked a value it remains clicked so even when it went invisible and came back to visible it remembers the selection. Thats why soon after BACK inserts blank in cell B7 the Pie chart 2 inserts the last selected value there and changes the logic.
You seem to have solved a huge problem by using the grid. So keep that in place and hide it behind a background.
Thanks
Runali