You can set the dock mode at design time using the C1DockTabControl.DockMode property.

To set the dock mode, follow these steps:

1. Open the .xaml page in Visual Studio.
2. Place your cursor between the <Grid></Grid> tags.
3. In the Toolbox, double-click the C1DockControl icon to add the control to the project.
4. Place your cursor between the <c1:C1DockControl> and </c1:C1DockControl> tags.
5. In the Toolbox, double-click the C1DockTabControl icon to add the control to the project.
6. Set the DockMode property to Sliding. Your XAML markup will now look similar to this:

   XAML	Copy Code
   <c1:C1DockControl> <c1:C1DockTabControl DockMode="Sliding"></c1:C1DockTabControl> </c1:C1DockControl>

7. Place your cursor between the <c1:C1DockTabControl> and </c1:C1DockTabControl> tags.
8. In the Toolbox, double-click the C1DockTabItem icon to add the control to the project and set the C1DockTabItem.Header property to Toolbox. Your XAML should look similar to the following:

   XAML	Copy Code
   <c1:C1DockControl> <c1:C1DockTabControl DockMode="Sliding"> <c1:C1DockTabItem Header="Toolbox"></c1:C1DockTabItem> </c1:C1DockTabControl> </c1:C1DockControl>

9. Run your project. The C1DockControl will resemble the following image:

   

10. Click the Toolbox tab to slide the window into view.