Opening an entire element in a window?

Question

Delphi

I know it is possible to create a new form and open it through showmodal
But I basically do not need to create a new form. All work should be in 1 window.
I have a
PageControl
It has 2 pages
In each DBgrid
I need to open a whole element in a separate window (modal so to speak) when the button is clicked, namely the entire table.

Answer 1

Create any control on top of everything, for example, you can use TPanel. Place everything you need on it and make it invisible. If necessary, change its visibility back to True.
If this does not suit you and you need it "in a separate window", then it is not entirely clear how this correlates with your phrase "All work should be in 1 window.".