Question

I have a WPF control (ControlA) which references another control (ControlB) like so:

<Grid>
    <controls:ControlB x:Name="ControlB"  />         
    <my:DataGrid 
        x:Name="dataGridBackup" 
        ItemsSource="{Binding}" 
        AutoGenerateColumns="False" >
        <my:DataGrid.Columns>
            <my:DataGridCheckBoxColumn 
                Header="Connectable" 
                Binding="{Binding Connectable}"  />
        </my:DataGrid.Columns>
    </my:DataGrid>
</Grid>

Now in ControlB I have a button and i want to bind the IsEnabled property to the Connectable column of my Grid on controlA.

I can get it working when i have the controls on the same page but not in the aboce scenario. I tried with

<Button 
    IsEnabled="{Binding ElementName=dataGridBackup, Path=SelectedItem.Connectable}">
</Button>

Answer 1

Button inside ControlB has no normal way to know what’s outside the control ControlB. One possible solution is to add boolean dependency property to ControlB like IsConnectable. In XAML of control ControlA, bind the property to dataGridBackup with path, like you did. In XAML of control ControlB, bind the button’s IsEnabled property to IsConnectable of ControlB.