This is my app architechture. Note that I have conductor as another conductor's child.And I have IHandle for each conductor to receive message from it's child.The message type is same as I use message just to navigating.
My problem are I pass ShellView's EventAggregator to it's children.How about NewConnectionView's EventAggregator ?Since I use it's EventAggregator for navigating on ShellView.And for it's children to navigating on it's ActiveItem.How to seperate these 2 EventAggregator in one ViewModel.

ShellView & NewConnectionView --> Conductor.Collection.OneActive

                                         +----------------------------------+
                                         | ShellView                 |_|[]|x|
                                         +----------------------------------+
                                         | +------------------------------+ |
                                         | |                              | |
                                         | |                              | |
                                         | |                              | |
                                         | |         ActiveItem           | |
                                         | |                              | |
                                         | |                              | |
                                         | |                              | |
                                         | +------------------------------+ |
                                         +----------------------------------+
                                                     /       \
                                                    /         \
                                                   /           \
                                                  /             \
                                                 /               \
                                                /                 \
                                               /                   \
                     +----------------------------------+    +----------------------------------+
                     | NewConnectionView         |_|[]|x|    | ConnectionListView        |_|[]|x|
                     +----------------------------------+    +----------------------------------+
                     | +------------------------------+ |    | TextBlock                        |
                     | | ComboBox                 | V | |    | +----------------------+ +-----+ |
                     | +------------------------------+ |    | |                      | | Btn | |
                     | +------------------------------+ |    | |                      | +-----+ |
                     | |                              | |    | |                      | +-----+ |
                     | |                              | |    | |                      | | Btn | |
                     | |                              | |    | |    DataGrid          | +-----+ |
                     | |         ActiveItem           | |    | |                      | +-----+ |
                     | |                              | |    | |                      | | Btn | |
                     | |                              | |    | |                      | +-----+ |
                     | |                              | |    | |                      |         |
                     | +------------------------------+ |    | +----------------------+         |
                     +----------------------------------+    +----------------------------------+
                                 /       \
                                /         \
                               /           \
                              /             \
                             /               \
                            /                 \
                           /                   \
 +----------------------------------+    +----------------------------------+
 | FileConnectionView        |_|[]|x|    | DatabaseConnectionView    |_|[]|x|
 +----------------------------------+    +----------------------------------+
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 +----------------------------------+    +----------------------------------+

Currently, my approach is using NewConnectionShellView (Screen) to separate the EventAggregator But the problem is, I can't get DisplayName of the NewConnectionView's children to display into my Main Window (ShellView). Please note that I'm not using MEF. Is there any workaround for my problem ?

                                         +----------------------------------+
                                         | ShellView                 |_|[]|x|
                                         +----------------------------------+
                                         | +------------------------------+ |
                                         | |                              | |
                                         | |                              | |
                                         | |                              | |
                                         | |         ActiveItem           | |
                                         | |                              | |
                                         | |                              | |
                                         | |                              | |
                                         | +------------------------------+ |
                                         +----------------------------------+
                                                     /       \
                                                    /         \
                                                   /           \
                                                  /             \
                                                 /               \
                                                /                 \
                                               /                   \
                     +----------------------------------+       +----------------------------------+ 
                     | NewConnectionShellView    |_|[]|x|       | ConnectionListView        |_|[]|x| 
                     +----------------------------------+       +----------------------------------+ 
                     | +------------------------------+ |       | TextBlock                        | 
                     | |                              | |       | +----------------------+ +-----+ | 
                     | |                              | |       | |                      | | Btn | | 
                     | |                              | |       | |                      | +-----+ |
                     | |                              | |       | |                      | +-----+ | 
                     | |                              | |       | |                      | | Btn | | 
                     | |                              | |       | |    DataGrid          | +-----+ | 
                     | |         ActiveItem           | |       | |                      | +-----+ | 
                     | |                              | |       | |                      | | Btn | | 
                     | |                              | |       | |                      | +-----+ | 
                     | |                              | |       | |                      |         | 
                     | +------------------------------+ |       | +----------------------+         | 
                     +----------------------------------+       +----------------------------------+ 
                                    |
                                    |
                                    |
                                    |
                                    |
                                    |
                                    |
                                    |
                                    V
                     +----------------------------------+
                     | NewConnectionView         |_|[]|x|
                     +----------------------------------+
                     | +------------------------------+ |
                     | | ComboBox                 | V | |
                     | +------------------------------+ |
                     | +------------------------------+ |
                     | |                              | |
                     | |                              | |
                     | |                              | |
                     | |         ActiveItem           | |
                     | |                              | |
                     | |                              | |
                     | |                              | |
                     | +------------------------------+ |
                     +----------------------------------+
                                 /       \
                                /         \
                               /           \
                              /             \
                             /               \
                            /                 \
                           /                   \
 +----------------------------------+    +----------------------------------+
 | FileConnectionView        |_|[]|x|    | DatabaseConnectionView    |_|[]|x|
 +----------------------------------+    +----------------------------------+
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 |                                  |    |                                  |
 +----------------------------------+    +----------------------------------+