Command binding across the view models in MVVM

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C#

Hi,

Any one please suggest me a way to bind the command across the view models other than using Messenger.
Please find my code below.
I need to bind the command of MenuItem with RelayCommand property which exists in other view model.
Below is the way I tried out.it doesnot however.

<igDock:ContentPane Header="Dashboard" x:Name="dashboardWindow" DataContext="{Binding Path=viewModels:DashboardViewModel.}"  AllowClose="False">
                                  <ContentControl Content="{Binding ElementName=panelUI, Path=DashboardControl, Mode=TwoWay}"/>
                                  <ContentControl.ContextMenu>
                                      <ContextMenu>
                                          <MenuItem  Header="Add New Tile" Command="{Binding ElementName=dashboardWindow,Path=viewModels:DashboardViewModel.AddTileContextMenuCommand}"></MenuItem>
                                      </ContextMenu>
                                  </ContentControl.ContextMenu>
                              </igDock:ContentPane>