Use the various container controls to organize your controls into groups.
The split container, show below, has two panels on either side of a
splitter. You can also see below that the left hand side contains a group
container that draws a background and border appropriate to the palette.
Often you need to provide a heading to for a group in which case you
should use the header group control. You can see below that there are
two headings that can be positioned as needed as well as allowing extra
buttons to be placed within them.