The bug report has been updated and a fix will be available in the next hotfix release.

Unfortnately, we do not provide sample with entity framework data, however I believed the process will be similar with entity framework.

Based on my test with the enfity framework data, I could not replicate the issue. The selectedItem will be correctly set with the selected object in the UXListBox. Attached is the test page I am using to test this issue.

We also have released a new ClientUI build in the WebUI Studio 2010 R1 SP1, if you have not update to the latest build build please do so.

FYI, the option to modify default WindowButtonStyle is only available on Expression Blend. In the UXWindow context menu, choose Edit Additional Templates > Edit WindowButtonStyle > Edit a Copy...

Unfortunately, UXDock has not implement scrolling feature yet. Based on my discussion with the developer, the closest workaround which will maintain UXDock behavior would be to implement paging feature.

You could achieve this by editing the default UXDock template so ItemsPresenter will have a perdefined width, you also need to add elements to move the page forward or backward. Here is the snippet of a modified portion of the default UXDock template:

<Setter Property="Template">
	<Setter.Value>
		<ControlTemplate TargetType="Intersoft:UXDock">
			<Grid>
				<Grid x:Name="RootElement">
					<Intersoft:ContentTransformer x:Name="ContentTransformer" IsHitTestVisible="False">
						<StackPanel x:Name="BackgroundLayoutElement" HorizontalAlignment="Center" Orientation="Horizontal" VerticalAlignment="Bottom">
							<Grid x:Name="BackgroundContainerLeftElement">
								<Image x:Name="BackgroundImageLeftElement" Visibility="Collapsed"/>
							</Grid>
							<Grid x:Name="BackgroundContainerElement">
								<Grid x:Name="BackgroundTemplateElement"/>
								<Border x:Name="BackgroundElement" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="{TemplateBinding CornerRadius}"/>
								<Image x:Name="BackgroundImageCenterElement" Visibility="Collapsed"/>
							</Grid>
							<Grid x:Name="BackgroundContainerRightElement">
								<Image x:Name="BackgroundImageRightElement" Visibility="Collapsed"/>
							</Grid>
						</StackPanel>
					</Intersoft:ContentTransformer>
					<StackPanel x:Name="LayoutElement" Orientation="Horizontal"/>
					<StackPanel x:Name="StructureElement" HorizontalAlignment="Center" Orientation="Horizontal" VerticalAlignment="Center">
						<StackPanel x:Name="StructureLeft" IsHitTestVisible="False" Orientation="Horizontal"/>
						<Intersoft:UXButton Height="65" Width="10" Content="Less"/>
						<Grid Width="400">
							<ItemsPresenter x:Name="ItemsPresenter"/>
						</Grid>
						<Intersoft:UXButton Height="65" Width="10" Content="More"/>
						<StackPanel x:Name="StructureRight" IsHitTestVisible="False" Orientation="Horizontal"/>
					</StackPanel>
				</Grid>
			</Grid>
		</ControlTemplate>
	</Setter.Value>
</Setter>

You also need to implement the logic to add the new item when moving forward or backward.

I could also replicate the issue on my environment. Based on my analysis the WebGrid expect a rowIndex attribute to be available in the row element. In order to resolve the issue I set the rowIndex attribute to have the same value as recordIndex attribute. Here is the updated snippet:

function WebGrid1_OnAfterResponseProcess(controlId, actionName, lastRequestObject, xmlResponseObject)
{
	var WebGrid1 = ISGetObject(controlId);
	if (actionName == "LoadGroup" && IS.IsXHTMLDocType() && IS.ie){
		var childRows = WebGrid1.GetSelectedObject().GetRowElement().parentElement.nextSibling.getElementsByTagName("tr");
		for (var i = 0; i < childRows.length; i++) {
			childRows[i].style.display = "";
			childRows[i].setAttribute("rowIndex",childRows[i].recordIndex);
        }
    }
            
	return true;
}