Fill Grid width inside a listbox

Question

I have a grid as the datatemplate for items in a listbox and it\'s not filling the whole width of the control. I have tried the suggestions in the other questions but they a

Answer 1

You need to make the ListBoxItems stretch their content, either by changing the respective property on the ListBox:

<ListBox HorizontalContentAlignment="Stretch" ...>

...or by setting it on the items via the ItemContainerStyle:

<ListBox.ItemContainerStyle>
    <Style TargetType="{x:Type ListBoxItem}">
        <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
    </Style>
</ListBox.ItemContainerStyle>

By default both will work as the ListBoxItem default style binds the HorizontalContentAlignment property to the owning ListBox's property.