Detect which element scrollbars belong to

Question

I have a relatively complex layout. It consists of: A grid with one column and three rows. In the first row (the on giving me trouble) I have a developer express componenet - another GridControl.

My problem is, that though the height of this first row is Auto, the vertical scrollbar displays even though there's space enough for content.

I've tried setting the ScrollViewer.VerticalScrollBarVisibility="Hidden" on the row's rowdefinition, but this doesn't help.

Likewise, I've set the inner GridControl to not use scrollbars (using some Developer Express magic - not just ScrollViewer as this doesn't work)

Yet, no matter what I do, that damn scrollbar appears... Is there any way to figure out which control renders it, so I can disable the damn thing? It's not just a question of it being ugly - scrolling it actually messes with the layout!

Thanks in advance!

The relevant code:

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" ScrollViewer.VerticalScrollBarVisibility="Hidden" />
        <RowDefinition Height="*" MaxHeight="240" />
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <dxg:GridControl Name="StudySizeGrid" Grid.Column="0" Grid.Row="0" >
        <dxg:GridControl.Resources>
            <ControlTemplate x:Key="{dxgt:TableViewThemeKey ResourceKey=ControlTemplate}">
                <ScrollViewer x:Name="scr" 
          VerticalScrollBarVisibility="Disabled" 
          HorizontalScrollBarVisibility="Disabled"
          Focusable="False"
          dxg:GridControl.CurrentView="{Binding RelativeSource={RelativeSource TemplatedParent}}"
          Template="{DynamicResource {dxgt:TableViewThemeKey ResourceKey=ScrollViewerTemplate}}">
                    <ScrollViewer.CanContentScroll>False</ScrollViewer.CanContentScroll>
                </ScrollViewer>
            </ControlTemplate>
        </dxg:GridControl.Resources>
...
</dxg:GridControl>

EDIT FOR CLARIFICATION: This is WPF issue :-)

I'm sorry, as my boss is really paranoid, and we're developing this for a 3rd party, I'm not allowed to upload a screenshot :/ It's stupid, but I can't really go against the word of the higher-ups... — Fafnr

H.B. H.B. · Accepted Answer · 2011-05-10T09:24:59

You could try checking out the VisualTree, i think Snoop might be helpful for that, it probably has some other useful features too. Getting the VisualTree is a trivial matter though, you can write a single recursive method using the VisualTreeHelper, so you might not need the big guns.

e.g.

public static TreeViewItem GetVisualTree(this DependencyObject dpo)
{
    TreeViewItem item = new TreeViewItem();
    item.Header = dpo.GetType().ToString().Split('.').Last();
    if (dpo is FrameworkElement && (dpo as FrameworkElement).Name != string.Empty) item.Header += " (" + (dpo as FrameworkElement).Name + ")";
    int cCount = VisualTreeHelper.GetChildrenCount(dpo);
    for (int i = 0; i < cCount; i++)
    {
        item.Items.Add(VisualTreeHelper.GetChild(dpo, i).GetVisualTree());
    }
    return item;
}

Wrote that quite some time ago, it's very sketchy (wouldn't recommend making it an extension method), gets the whole tree at one, could be modified to only fetch children on expansion of the node.

Detect which element scrollbars belong to

2 Answers