How to show the text in a textBlock in my user control?

Question

in my UC i have a textBlock . the text that i put through the xaml or the text that i put through the C# doesn't show:
<local1:Cell x:Class="UserControls.HintCell"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local1="clr-namespace:UserControls"
mc:Ignorable="d" d:DesignHeight="130" d:DesignWidth="130" Loaded="UserControl_Loaded" >
<Grid x:Name="hintGrid" MouseLeave="hintGrid_MouseLeave">
<Grid x:Name="topTriangle" x:FieldModifier="public">
<Polygon Name="triangle_top" Points="0,0 130,0, 130,130" Stroke="Black" Fill="Red" MouseEnter="triangle_MouseEnter" MouseLeave="triangle_MouseLeave" />
<TextBlock Name="text_top" Margin="82,20,20,76" FontSize="25" Text="55" Foreground="Black" x:FieldModifier="public"/>
</Grid>
<Grid x:Name="bottomTriangle" x:FieldModifier="public">
<Polygon Name="triangle_bottom" Points="0,0 130,130, 0,130" Stroke="Black" Fill="Red" MouseEnter="triangle_MouseEnter" MouseLeave="triangle_MouseLeave"/>
<TextBlock Name="text_bottom" Margin="15,80,77,16" FontSize="25" Text="88" x:FieldModifier="public" />
</Grid>
</Grid>
</local1:Cell>
and the designer:
but, when debugging the text doesn't show:
i was told maybe to define the user control or the  text as a dependency property, i don't know how to do it and maybe someone has a better solution?
thanks.

Answer 1

thanks. but i didn't really understand, maybe you can give an example with my parameters?
The text dependency property is called LabelFor.
It's this bit.
public string LabelFor
get { return (string)GetValue(LabelForProperty); }
set { SetValue(LabelForProperty, value); }
public static readonly DependencyProperty LabelForProperty = DependencyProperty.RegisterAttached(
"LabelFor",
typeof(string),
typeof(EditRow));
You would substitute the name of your usercontrol for EditRow when you cut and paste that into it.
There is a style which defines what EditRow looks like by giving it a template.
<Style TargetType="{x:Type local:EditRow}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:EditRow}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="{Binding RelativeSource={
RelativeSource FindAncestor,
AncestorType=local:EditRow},
Path=LabelWidth, TargetNullValue=2*}"/>
<ColumnDefinition Width="{Binding RelativeSource={
RelativeSource FindAncestor,
AncestorType=local:EditRow},
Path=PropertyWidth, TargetNullValue=3*}"/>
</Grid.ColumnDefinitions>
<TextBlock Text="{Binding RelativeSource={
RelativeSource FindAncestor,
AncestorType=local:EditRow},
Path=LabelFor}"
HorizontalAlignment="Right"
Margin="0,4,0,0"/>
<Border Margin="6,2,6,2" Padding="0,2,0,2" Grid.Column="1" >
<ContentPresenter HorizontalAlignment="Stretch"/>
</Border>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
That uses binding to give the textblock text property the value of LabelFor.
You could instead put your markup directly in your usercontrol and bind it like that.
This bit would then pretty much cut and paste in
<TextBlock Text="{Binding RelativeSource={
RelativeSource FindAncestor,
AncestorType=local:EditRow},
Path=LabelFor}"
You would need two of course if you have two textblocks.
ps
People have suggested dependency property to you because this is how properties on wpf controls work.  
If you instead chose to use properties then you lose the ability to set value by style, animation, binding etc Your usercontrol will not behave like a wpf control.  This might not really concern you if you're just working on your own on an app.
It would if you were working in a team though.
Personally, I would reject code which exposed regular properties from a usercontrol at walk through.
Hope that helps.
Recent Technet articles:
Property List Editing;  
Dynamic XAML