Question

How can I hide the last two rows after resizing of splitter?
When last two rows are hidden, the webBrowser should fill all the area.

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="*" />
        <RowDefinition Height="5" />
        <RowDefinition Height="Auto" />
    </Grid.RowDefinitions>
    <WebBrowser Name="webBrowser" />
    <GridSplitter Grid.Row="1" ResizeDirection="Rows" 
                  ResizeBehavior="PreviousAndNext" Width="Auto" Height="5" 
                  HorizontalAlignment="Stretch"
                  Visibility="...">
    </GridSplitter>
    <c:MyControl Grid.Row="2" Visibility="..." />
</Grid>

Answer 1

Quick fix of this issue:

    public class HideableGridSplitter : GridSplitter
    {
        private GridLength height;

        public HideableGridSplitter()
        {
            this.IsVisibleChanged += HideableGridSplitter_IsVisibleChanged;
        }

        void HideableGridSplitter_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            Grid parent = base.Parent as Grid;
            if (parent == null)
                return;
            int rowIndex = Grid.GetRow(this);
            if (rowIndex + 1 >= parent.RowDefinitions.Count)
                return;
            var lastRow = parent.RowDefinitions[rowIndex + 1];

            if (this.Visibility == Visibility.Visible)
                lastRow.Height = height;
            else
            {
                height = lastRow.Height;
                lastRow.Height = new GridLength(0);
            }
        }
    }