WPF Bind to ViewModel of another element

Question

Just an example. The CustomControl has a ViewModel with a property called "Test"

How could I bind the textbox to that specific property? Can you access the siblings ViewModel?

<TextBox Text="{Binding ElementName=myControl, Path=ViewModel.Test}"></TextBox>
<Controls:CustomControl x:Name="myControl" />

Answer 1

Siblings ViewModel would be in its DataContext try

<TextBox Text="{Binding ElementName=myControl, Path=DataContext.Test}"></TextBox>
<Controls:CustomControl x:Name="myControl" />