Hi Scott,
Adding the default Navigation Button to the toolbar is not possible. But you can navigate the MdiTab using your own code. I have created a sample and attached here. Please refer the attached sample.
TabbedMdiNavigate
Also You can add the Navigation control to TabbedMdi. If you are using 4.2 or below, you can use TabControlAdded event and set the Visible property of the NavigationControl to true.
Ex:
private void TabControl_Added(object sender, TabbedMDITabControlEventArgs e)
{
e.TabControl.NavigationControl.Visible = true;
}
In upcoming version 4.4 the NavigationControl property has been changed as TabPrimitives. TabPrimitives provides more flexibility and it allows users to add any number of buttons in the TabPanel. You can comment out the NavigationControl code in the designer generated code and compile the solution to make it work properly TabPrimitives can be made visible by setting TabPrimitivesHost.Visible property to true.
Thank you for using Syncfusion products.
Regards,
S.Gopal.