Illustrates how to use WorldWind within a Swing JSplitPane. Doing so is mostly straightforward, but in order to work
around a Swing bug the WorldWindow must be placed within a JPanel and that JPanel's minimum preferred size must be
set to zero (both width and height). See the code that does this in the first few lines of the AppPanel constructor
below.
This example also illustrates another bug in Swing that does not have a known workaround: the WorldWindow does not
resize when a vertical split-pane's one-touch-expand widget is clicked if that split-pane contains a horizontal
split-plane that contains the WorldWindow. If the one-touch widget is clicked on the bottom pane of this example,
that pane will expand to the full height of the window but the WorldWindow will not change size and will display on
top of the expanded pane. (The horizontal split pane's one-touch behavior works correctly.) If the panes are
rearranged so that the WorldWindow and the bottom panel are in one vertical split pane, and that split pane is the
right component of the horizontal split pane containing the layer panel, then the one-touch widgets work correctly
for both JSplitPanes. This bug is related only to the one-touch widget. Moving the vertical split-pane interactively
via the split-pane's handle works correctly.