protected JPanel createContentControl() {
TableLayoutBuilder panelBuilder = new TableLayoutBuilder();
String colSpec = "colSpec=" + getTreeControlWidth() + " rowSpec=fill:default:grow";
panelBuilder.cell(new JScrollPane(pageTree), colSpec);
panelBuilder.gapCol();
panelBuilder.cell(pagePanel, "valign=top");
return panelBuilder.getPanel();
}
/**
* Get the width of the tree component to use in the final control construction. This