I used the sample http://forums.microsoft.com/MSDN/ShowPost.aspx PostID=96651&SiteID=1
of Beatriz, where a slider changes the LayoutTransform of a TreeView.
The only thing i changed was that i use "UserTreeView" instead of TreeView.
Whereas UserTreeView ist derived from TreeView.
Here is the exception:
Cannot find source for binding with reference 'ElementName=slider'.
BindingExpression:Path='Value'; DataItem=''null'';
target element is 'UserTreeView (Name='tree')'; target property is 'LayoutTransform' (type 'Transform');
Is this a bug Or is anything wrong.
ElementName does not work on derived UserControls?
Jayson Valencia
Beatriz, I wish I had found this thread earlier. Can you confirm that this is the same bug that I am running against here: http://forums.microsoft.com/MSDN/ShowPost.aspx PostID=454274&SiteID=1
Basically, the following xaml works when it is inside a page, but when I extract it into a usercontrol, the itemssource is not set:
<ItemsControl ItemsSource="{Binding ElementName=lb, Path=SelectedItem, Mode=Default}" >
<ItemsControl.Style>
<Style TargetType="{x:Type ItemsControl}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ItemsControl}">
<StackPanel Orientation="Horizontal">
<Button>press me</Button>
<ScrollViewer VerticalScrollBarVisibility="Auto">
<StackPanel Orientation="Horizontal"
IsItemsHost="True" />
</ScrollViewer>
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ItemsControl.Style>
</ItemsControl>
Michael King
ZENPook
Hi Roland,
That is a bug. It seems like the same issue reported in this post (I mean, different issue, but with the same cause): http://forums.microsoft.com/MSDN/ShowPost.aspx PostID=434020&SiteID=1. Basically there are some issues with name scoping and custom controls in Beta 2 that affect binding. I will make sure I will verify your scenario when we get the fix for the bug. Hopefully you will find a fix for this on our next release.
This kind of feedback is absolutely invaluable to us before we ship. Thanks a lot for reporting the issue!
Bea