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Recently I'm excited to find some youtube tutorials about onchartevent and button and dialog,etc. in official library. I successfully wrote a code with button, as well as with button in a dialog. But then when I tried to code a dropdown list (not in input and ENUM..., I want the button in chart), I don't know which but I think combobox is what I have to use, and the following code does not work as wish, there's no default value, and whatever I chose it kept empty. Is there any example code out there I could learn from? Or detailed documentation about everything in official library?