When the left or right pane is resized, some of the components within that pane may not get resized properly.

The underlying framework manages the layout of the components it knows about in its component hierarchy, so that (among other things) it can recalculate the layout on resize events. For example, when a resize event happens, it would recalculate the layout of its children, and those children’s children, and so on. Because the two pane component simply renders its contents to the DIV corresponding to the pane, and does not actually add its contents as a child of the pane’s panel, nesting components (especially those components that are containers to house other components) within a pane may not behave as expected.