WPF: Binding the height of a component to another's

Question

I have, in a window, a Grid that contains a RadioButton, a TextBox and a Button, each in column 0, 1, 2, respectively. Th

Answer 1

Put the two grids in a shared size scope, and use SharedSizeGroup to lock the row heights together:

<SomeContainer Grid.IsSharedSizeScope="True">  <!-- Could be the Window or some more nearby Panel -->
  <Grid>
    <Grid.RowDefinitions>
      <RowDefinition SharedSizeGroup="LabelAndRadioButtonGroup" />
    </Grid.RowDefinitions>
    <Label Grid.Row="0" />
  </Grid>
  <Grid>
    <Grid.RowDefinitions>
      <RowDefinition SharedSizeGroup="LabelAndRadioButtonGroup" />
    </Grid.RowDefinitions>
    <RadioButton Grid.Row="0" />
  </Grid>
</SomeContainer>

See also How to: Share sizing properties between grids in MSDN.

Answer 2

Bind to the ActualHeight rather than the Height property:

<RowDefinition Height="{Binding ActualHeight, ElementName=otherTextBox}" />