WPF GridSplitter Doesn't Work With WebBrowser Control?

Answer 1

I know you're probably sick of hearing this, but I can't reproduce your problem when I use the XAML above, slightly modified to be pure XAML:

( XAML code moved into question. )

Could there be something in your code-behind that is causing the behavior?

Answer 2

I was able to reproduce this with a Border in a ScrollViewer (but not without a ScrollViewer), so my guess is that the scrolling messes it up somehow.

Setting a MaxWidth on the left column (a very large MaxWidth that should have no practical effect) seemed to fix it:

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Height="300"
        MinWidth="450"
        Width="450"
        Title="Window3">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition MinWidth="200" Width="*" MaxWidth="10000"/>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition MinWidth="200" Width="*"/>
        </Grid.ColumnDefinitions>
        <Button
            Name="Button2"
            Grid.Column="0"
            Margin="5"
            Content="Button2"/>
        <GridSplitter
            Width="2"
            Grid.Column="1"
            HorizontalAlignment="Center"
            Margin="5"
            Panel.ZIndex="1"
            VerticalAlignment="Stretch"
            ResizeBehavior="PreviousAndNext"
            ResizeDirection="Columns"/>
        <WebBrowser Grid.Column="2" Margin="5" Source="http://www.google.com"/&gt;
    </Grid>
</Window>

It appears that at some point, the star sizing overrides the fact that there's no space left, so when the left column reaches Width = 200, and the GridSplitter has changed the star size of the right column to 3* or so, the column will be 600 whether there is space or not.