Set Visibility of Button depending from selected Tab

Question

I have a Button and a TabControl with some Tabs. I want to hide the button, if the second tab is selected. This is my approach, but the button does not disappear if I click

Answer 1

Because you want to bind to the property of another element in your application you should use Binding.ElementName Property and Path like this:

<DataTrigger Binding="{Binding  ElementName=TabMainControl, Path=SelectedIndex}" Value="1">
    <Setter Property="Visibility" Value="Hidden" />
</DataTrigger>