// check button widths in VerticalLayout
VerticalLayoutElement vLayout = $(VerticalLayoutElement.class).$(
VerticalLayoutElement.class).first();
int containerWidth = vLayout.getSize().getWidth();
NativeButtonElement nativeButton = vLayout.$(NativeButtonElement.class)
.first();
int buttonWidth = nativeButton.getSize().getWidth();
assertButtonWidth(buttonWidth, containerWidth);
ButtonElement button = vLayout.$(ButtonElement.class).first();
buttonWidth = button.getSize().getWidth();