WPF: Bind width on UI element to Width of another UI Element?

Remove the HorizontalAlignment="Center" from the TextBlock or set the property to Stretch . Then the TextBlock will consume all available width automatically. Furthermore, if you don't show anything else than the textblock, then remove the grid and use just the TextBlock.

You also need to set HeaderTemplate rather the Header directly.

Try the markup below. Please note the use of HeaderStyle to stretch the template and HeaderTemplate to actually define the visual template for your Header="PDP" item.

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