<ToggleButton  Checked="myprop_Checked" Unchecked="myprop__Unchecked" x:Name="myprop" Margin="-20,0,0,0" IsChecked="{Binding myprop, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" >
                            <ToggleButton.IsEnabled>
                                <MultiBinding Converter="{StaticResource isEnabledConv}">
                                    <Binding Path="prop1"/>
                                    <Binding Path="toggle2"/>
                                    <Binding Path="prop1" ElementName="IsEnabled"/>
                                </MultiBinding>
                            </ToggleButton.IsEnabled>