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Next: You should resize, or preferably dock, the GroupBox. Then you can add more controls inside the GroupBox by dragging.
Tip: This means you can have fluidly-resizing windows that always look great, regardless of a system's setup.
Then: Scroll to Dock, and click one of the six buttons. These are easy to figure out, but I describe them here.
GroupBox options
Top, Bottom, Left, Right:
These will push the control to the selected edge.
Center:
This will expand the control to fill the entire window.
Shown in the GroupBox in this tutorial.
None:
The default, this will disable docking.
Note: Dock is also an important property. Please see the above notes on docking.
Tip: Typically, when designing user interfaces, it is a good idea to create abstractions that can be reused.
And: These designs should not rely on a specific user interface toolkit for logic.