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I am trying to implement a feature in which we have two list box, based on selection of one list box the other list box data filters out. Based on the selection of the second listbox the charts are plotted. The problem is the charts are irrelevant if none of the values in the second listbox are selected. So there has to be a default value selected for both the listbox at any time.
If we transition from one value to another of the first listbox, corresponding value in the second listbox changes and a default value is also selected.
I have attached a file as a sample. Please suggest me a method to implement the same. Thank you