interaction between the ComboBox, Button and TDBCtrlGrid

I can't understand of interactionfunction of those ComboBox, Button and TDBCtrlGrid

Hello everyone,
I attached here my designed small program. The problem is that I can not make them work as one team... I'm using the ComboBox, Button and TDBCtrlGrid and I can not write codes that the code work as these ComboBox, Button and TDBCtrlGrid interaction togather, what I should do, what code should I write?
Which library are you using? What are you trying to achieve?
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