Caliburn.Micro - Passing combobox items to a button - wpf

Question

I'm trying to pass items from my Combobox (which is binded to my Model object's lists) to my button. My problem is that I'm new to Caliburn.Micro + WPF and not quite sure how to subscribe/pass the desired values to my button (like sending strings of a PropetyName to a Button(string propetyName)).
ViewModel code:
class ShellViewModel : Screen
{
private DataModel _fileInFolder;
private BindableCollection<DataModel> _data;
public ShellViewModel()
{
// .GetData() preforms the objects' initialization
DataModel dataOutput = new DataModel();
Data = new BindableCollection<DataModel>(dataOutput.GetData());
}
public BindableCollection<DataModel> Data
{
get
{
return _data;
}
set
{
_data = value;
NotifyOfPropertyChange(() => Data);
}
}
public DataModel FileInFolder
{
get { return _fileInFolder; }
set
{
_fileInFolder = value;
NotifyOfPropertyChange(() => FileInFolder);
}
}
//This is where the items will be passed to.
public void OpenFile()
{
}
}
XAML code:
<Grid>
<!-- Folders -->
<ComboBox ItemsSource="{Binding Data}" SelectedItem="{Binding FileInFolder}"
HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Width="250">
<ComboBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Folders}"/>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
<!-- Files -->
<ComboBox x:Name="FileInFolder_Files"
HorizontalAlignment="Left" Margin="280,10,0,0" VerticalAlignment="Top" Width="250"/>
<!-- Open File -->
<Button x:Name="OpenFile"
Content="Open File" HorizontalAlignment="Left" Margin="560,10,0,0" VerticalAlignment="Top" Width="90">
</Button>
</Grid>
Sorry if my description is vague/missing more clarification, I'm a new user here!

Answer 1

FileInFolder is the selected item of the combo.
OpenFile is in the same class and can therefore reference FileInFolder.
public void OpenFile()
{
var whatever = FileInFolder.SomeProperty;
// etc
}
You probably want some null checking in there.