How to set the First Line of Table UI in Web Dynpro ABAP

Hi Team,
I have a scenario where I'm displaying two Table controls one below the other. When a line is selected in the first(Top) table, I have a supply function(Event) and I fill the second(bottom) table. Everything works fine till here.
The problem starts when I scroll the bottom table. Lets assume that I'm at line 20 of the second table and I press the lead selection to select another line on the first table. Here the second table is filled with new data but it is automatically scrolled to line 20. My questions:
1) Do I have to set some specific property of the second table? If yes, which one and where should I set it (In the supply function? I already have the "visibleRowCount" set to "10")
2) How do I dynamically get access to the Table Control properties?
Thanks for your time

Thank you Maksim,
I did set the "selectionMode" to "Auto". I don't understand where In supply function I have to set lead selection of nested node to first element. Please elaborate on this. Are you talking about the context attribute bound to the second table? OR do I have to change the Importing parameters "Node" and "Parent_Element" of my supply function?
Thanks for your time.

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