When a C1OutlookBar is collapsed, the central content region can display customized collapsed content. In Microsoft Outlook 2007-2010, this area is simply vertical text that reads  "Navigation Pane". This region can be associated with a selected item for added flexibility, but this is not a requirement. There are two options for showing collapsed content.

Option A: Use the CollapsedContent property to display text when the C1OutlookBar is collapsed.

<c1:C1OutlookBar CollapsedContent = "Navigation Pane" />

Option B: Use the CollapsedContent property to display the same collasped content no matter which item is selected.

<c1:C1OutlookBar>
        <c1:C1OutlookBar.CollapsedContent>
              …
       </c1:C1OutlookBar.CollapsedContent>
 </c1:C1OutlookBar>

For example, see the following XAML displays "Navigation Pane" vertically.

<c1:C1OutlookBar.CollapsedContent>
                <c1:C1LayoutTransformer>
                    <c1:C1LayoutTransformer.LayoutTransform>
                        <RotateTransform Angle="270" />
                    </c1:C1LayoutTransformer.LayoutTransform>
                    <TextBlock FontSize="13" TextAlignment="Center" VerticalAlignment="Center"
                            Text="Navigation Pane" />
                </c1:C1LayoutTransformer>
            </c1:C1OutlookBar.CollapsedContent>