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Home/ Questions/Q 195525
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Editorial Team
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Editorial Team
Asked: May 11, 20262026-05-11T16:41:23+00:00 2026-05-11T16:41:23+00:00

I do not know what I am doing wrong here. In the XAML below,

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I do not know what I am doing wrong here. In the XAML below, the Border does not fill the available space on the tabItem (just lots of whitespace). How do I fill the entire tab page?

<TabControl>
    <TabItem Header="Plant State">
        <Border Background="Red" VerticalAlignment="Stretch" HorizontalAlignment="Stretch"></Border>
    </TabItem>
</TabControl>
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  1. Editorial Team
    Editorial Team
    2026-05-11T16:41:23+00:00Added an answer on May 11, 2026 at 4:41 pm

    I figured this out with the help of Matt Hamilton. This actually works fine if you are using a regular TabControl (default Template).

    I am using a xaml “theme” that alters the default control template. That is causing the layout to fail, so I will have to investigate and figure out what is wrong.

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