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POTwo UserControls, one binds, one doesn't
 

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  1. POTwo UserControls, one binds, one doesn't
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    <p>I have two very simple UserControls in a simple WinRT demo project. No Viewmodel--mostly just colored boxes for layout exploration. The first UserControl I created works fine. The second, very similar one, won't bind to any properties--it shows up as blank.</p> <p>The first UserControl looks like this:</p> <pre><code> &lt;UserControl x:Class="Demo.SmallStartTile" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:Demo" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Name="SmallStartTileUC" d:DesignHeight="300" d:DesignWidth="400"&gt; &lt;Grid x:Name="SmallTileGrid" Margin="0,0,8,8" Background="{Binding Background, ElementName=SmallStartTileUC}" &gt; &lt;Rectangle Stroke="{Binding BorderBrush, ElementName=SmallStartTileUC}" Grid.RowSpan="2" /&gt; &lt;TextBlock x:Name="SmallTileTitle" Text="{Binding TileText, ElementName=SmallStartTileUC}" Style="{StaticResource SmallTileHeader}"/&gt; &lt;Path x:Name="IconPath" Style="{StaticResource SmallTileIcon}" Data="{Binding TileIconPathData, ElementName=SmallStartTileUC}" /&gt; &lt;/Grid&gt; &lt;/UserControl&gt; namespace Demo { public sealed partial class SmallStartTile : UserControl { public static DependencyProperty TileTextProperty = DependencyProperty.Register("TileText", typeof(string), typeof(SmallStartTile), new PropertyMetadata("tile content")); public string TileText { get { return (string)GetValue(TileTextProperty); } set { SetValue(TileTextProperty, value); } } public static DependencyProperty TileIconPathDataProperty = DependencyProperty.Register("TileIconPathData", typeof(string), typeof(SmallStartTile), new PropertyMetadata("F0")); public string TileIconPathData { get { return (string)GetValue(TileIconPathDataProperty); } set { SetValue(TileIconPathDataProperty, value); } } public SmallStartTile() { this.InitializeComponent(); } } </code></pre> <p>}</p> <p>And the second one, which I made just like the first one by clicking Add New Item and picking UserControl in Blend:</p> <pre><code>&lt;UserControl x:Class="Demo.SmallMediaTile" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:Demo" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Name="SmallMediaTileUC" d:DesignHeight="300" d:DesignWidth="400"&gt; &lt;Grid Margin="0,0,8,8" Background="{Binding Background, ElementName=SmallMediaTileUC}" &gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition/&gt; &lt;RowDefinition Height="Auto"/&gt; &lt;/Grid.RowDefinitions&gt; &lt;Rectangle Stroke="{Binding BorderBrush, ElementName=SmallMediaTileUC}" Grid.RowSpan="2" /&gt; &lt;Viewbox Margin="30" Child="{Binding Content, ElementName=SmallMediaTileUC}"&gt; &lt;/Viewbox&gt; &lt;TextBlock Grid.Row="1" Text="{Binding SourceText, ElementName=SmallMediaTileUC}" Style="{StaticResource SmallMusicTileHeader}"/&gt; &lt;/Grid&gt; &lt;/UserControl&gt; namespace Demo { public sealed partial class SmallMediaTile : UserControl { public static DependencyProperty SourceTextProperty = DependencyProperty.Register("SourceText", typeof(string), typeof(SmallMediaTile), new PropertyMetadata("source")); public string SourceText { get { return (string)GetValue(SourceTextProperty); } set { SetValue(SourceTextProperty, value); } } public SmallMediaTile() { this.InitializeComponent(); } } </code></pre> <p>}</p> <p>I use the UserControl in the main Page like this:</p> <pre><code> &lt;local:SmallMediaTile x:Name="Source1Tile" Grid.Column="0" Grid.Row="0" SourceText="Radio" Background="Blue" BorderBrush="Red"&gt; &lt;local:SmallMediaTile.Content&gt; &lt;Canvas x:Name="radio_icon" Height="68" Width="34"&gt; &lt;Path Data="F1M299.6182,396.2988C299.6182,389.7208,297.0722,383.5548,292.4572,378.8398L288.6162,382.6758C292.2022,386.3718,294.1842,391.1778,294.1842,396.2988C294.1842,401.4238,292.2022,406.2368,288.6162,409.9328L292.4572,413.7738C297.0722,409.0538,299.6182,402.8808,299.6182,396.2988" Fill="White" Height="34.934" Canvas.Left="0" Stretch="Fill" Canvas.Top="16.501" Width="11.002"/&gt; &lt;Path Data="F1M311.1738,396.2988C311.1738,386.6278,307.4348,377.5528,300.6788,370.6208L296.8258,374.4618C302.5658,380.3698,305.7398,388.0798,305.7398,396.2988C305.7398,404.5218,302.5658,412.2298,296.8258,418.1428L300.6788,421.9898C307.4348,415.0498,311.1738,405.9718,311.1738,396.2988" Fill="White" Height="51.369" Canvas.Left="8.21" Stretch="Fill" Canvas.Top="8.282" Width="14.348"/&gt; &lt;Path Data="F1M322.7578,396.2988C322.7578,383.5298,317.8508,371.5348,308.9638,362.3388L305.1168,366.1748C312.9758,374.3538,317.3338,384.9778,317.3338,396.2988C317.3338,407.6208,312.9758,418.2488,305.1168,426.4268L308.9638,430.2748C317.8508,421.0698,322.7578,409.0798,322.7578,396.2988" Fill="White" Height="67.936" Canvas.Left="16.501" Stretch="Fill" Canvas.Top="0" Width="17.641"/&gt; &lt;/Canvas&gt; &lt;/local:SmallMediaTile.Content&gt; &lt;/local:SmallMediaTile&gt; </code></pre> <p>The first one picks up all the properties and displays like I expect, but the second one only picks up the Viewbox content. I've looked through SO and been googling but can't figure out what the problem is. Sorry if this is longwinded.</p>
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    1. COI can't see anything obvious but could you check for binding errors in your debug output window in Visual Studio?
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      1. USFilip Skakun
    2. CONo binding errors!
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    3. COWhat specifically doesn't work? I can see the control crashing for me when I try to bind the Child of the Viewbox to a non-existent Content property of the UserControl, but if I remove that - it seems to work fine.
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      1. POTwo UserControls, one binds, one doesn't
      1. USFilip Skakun
 

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