The TabPane control both doesn't respond to size changes from its children and doesn't size its children correctly when it is resized.
Try the sample program and resize the window. The wrappable labels inside the tab don't wrap as they are resized. Getting rid of the tabpane makes the panel resize properly.
Try the sample program and resize the window. The wrappable labels inside the tab don't wrap as they are resized. Getting rid of the tabpane makes the panel resize properly.