headerBackButton = new PreviousitemImageButton();
headerBackButton.setVisible(!MGWT.getOsDetection().isAndroid());
headerPanel.add(headerBackButton);
headerPanel.add(new FlexSpacer());
headerPanel.add(headerTitle);
headerPanel.add(new FlexSpacer());
FixedSpacer fixedSpacer = new FixedSpacer();
fixedSpacer.setVisible(!MGWT.getOsDetection().isAndroid());
headerPanel.add(fixedSpacer);
ScrollPanel scrollPanel = new ScrollPanel();