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POBinding to a UserControl's DependencyProperty
 

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  1. POBinding to a UserControl's DependencyProperty
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    <p>I'm trying to adapt a soltuion for the WPF toolkit's calendar from <a href="http://msdn.microsoft.com/en-us/magazine/dd882520.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/magazine/dd882520.aspx</a> but I'm having problems getting a binding on the usercontrol to work. I've tried using FindAncestor and ElementName, but I just get a binding error.</p> <p>I think it might have something to do with the tooltip and it's DataContext in the calendar. Has anyone else had this problem?</p> <pre><code>&lt;UserControl x:Class="ChickenPing.MealCalendar" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:conv="clr-namespace:ChickenPing.Converters" xmlns:wpf="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit" xmlns:primitives="clr-namespace:Microsoft.Windows.Controls.Primitives;assembly=WPFToolkit" xmlns:vsm="clr-namespace:System.Windows;assembly=WPFToolkit" xmlns:loc="clr-namespace:ChickenPing" x:Name="root"&gt; &lt;wpf:Calendar x:Name="calendar"&gt; &lt;wpf:Calendar.Resources&gt; &lt;conv:IconConverter x:Key="IconConverter"/&gt; &lt;conv:MealCalendarConverter x:Key="MealCalendarConverter" /&gt; &lt;!--LinearGradientBrush x:Key="MealBackgroundFill" StartPoint="0,0" EndPoint="0,1"&gt; &lt;GradientStop Color="" &lt;/LinearGradientBrush--&gt; &lt;/wpf:Calendar.Resources&gt; &lt;wpf:Calendar.CalendarDayButtonStyle&gt; &lt;Style TargetType="primitives:CalendarDayButton"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="primitives:CalendarDayButton"&gt; &lt;Grid&gt; &lt;!Grid.ToolTip&gt; &lt;ToolTip&gt; &lt;ToolTip.DataContext&gt; &lt;MultiBinding Converter="{StaticResource MealCalendarConverter}"&gt; &lt;Binding Path="PlacementTarget.DataContext" RelativeSource="{x:Static RelativeSource.Self}"/&gt; &lt;Binding Path="Meals"&gt; &lt;Binding.RelativeSource&gt; &lt;RelativeSource Mode="FindAncestor" AncestorType="{x:Type loc:MealCalendar}" /&gt; &lt;/Binding.RelativeSource&gt; &lt;/Binding&gt; &lt;/MultiBinding&gt; &lt;/ToolTip.DataContext&gt; </code></pre> <p>The error is:</p> <pre><code>System.Windows.Data Warning: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='MyAssembly.MyControl', AncestorLevel='1''. BindingExpression:Path=ConversionCollection; DataItem=null; target element is 'ToolTip' (Name=''); target property is 'DataContext' (type 'Object') </code></pre> <p>And the declaration for the DependencyProperty:</p> <pre><code>public static readonly DependencyProperty MealsProperty = DependencyProperty.Register("Meals", typeof(Dictionary&lt;DateTime, IEnumerable&lt;PlannedMealGroup&gt;&gt;), typeof(MealCalendar), new UIPropertyMetadata(new Dictionary&lt;DateTime, IEnumerable&lt;PlannedMealGroup&gt;&gt;())); public Dictionary&lt;DateTime, IEnumerable&lt;PlannedMealGroup&gt;&gt; Meals { get { return base.GetValue(MealsProperty) as Dictionary&lt;DateTime, IEnumerable&lt;PlannedMealGroup&gt;&gt;; } set { base.SetValue(MealsProperty, value); } } </code></pre> <p>There's another control I have where the same thing happens, so I think I may be missing something.</p>
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    1. COI`ve updated my answer in response to your edits.
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      1. POBinding to a UserControl's DependencyProperty
      1. USRichard McGuire
 

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