WPF slider to a "selected textbox" (on got focus) - wpf

Question

How is the right way to bind dynamically a TextBox to a Slider?
The idea is to have many textboxes. When the user click over a TextBox, it changes his Background Color (showing thats it has the focus) and then if the user change the value of the Slider, the Text property of the Selected Textbox should change.

Answer 1

I would so this by embedding the TextBoxes in a ListBox. That way you can use list box to handle the definition of what is focused by its SelectedItem, and then bind the slider to the listboxes selecteditem too.

Answer 2

As #AlSki mentioned you could use a ListBox to hold all your TextBoxes and bind to the SelectedItem
Example:
<StackPanel>
<Slider Value="{Binding SelectedItem.Text, ElementName=listbox}"/>
<ListBox Name="listbox">
<TextBox />
<TextBox />
<TextBox />
<TextBox />
</ListBox>
</StackPanel>
Or if the TextBoxes are layed out in a fashion that cant be used with an ItemsControl you could do this with by creating a TextBox Style and setting the Binding to the Slider in a Trigger
Example:
<StackPanel>
<StackPanel.Resources>
<Style TargetType="TextBox">
<Setter Property="Text" Value="{Binding RelativeSource={RelativeSource Self}, Path=Text, Mode=OneWay}" />
<Setter Property="Background" Value="White" />
<Style.Triggers>
<Trigger Property="IsFocused" Value="true">
<Setter Property="Background" Value="Yellow" />
<Setter Property="Text" Value="{Binding ElementName=slider, Path=Value, Mode=OneWay}" />
</Trigger>
</Style.Triggers>
</Style>
</StackPanel.Resources>
<Slider Name="slider" Focusable="False"/>
<TextBox />
<TextBox />
<TextBox />
<TextBox />
</StackPanel>