Question

Maybe title is confusing you, but the problem is concretely here : I have XAML file which there is ControlTemplate for MyType (inherits from ContentControl). And in that Template i set its DataContext like this :

DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}}"

And when i want to get DataContext from MyType it shows null for first time. After clicking on it ( it is rectangle in window ) it changes to object what i need. I searched all things, all events what i am doing in LeftButtonDown there is no ApplyTemplate(),UpdateLayout() methods. Even i call these methods it doesn’t help. What need to do ? P.S this DataContext is Parent of this item, i can send is a parameter but there must be other solution

this is part of XAML which Template located:

<Style TargetType="{x:Type s:Connector}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type s:Connector}">
                <Grid Name="grid" DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}}">
                    <Border BorderBrush="{Binding RelativeSource={RelativeSource Mode=TemplatedParent}, 
                        Path=BorderBrush}" x:Name="border" BorderThickness="2" Background="Transparent">        
                        <Image Source="/DiagramDesigner;component/Resources/1337238611_port.png"/>
                    </Border>
                    <Rectangle Fill="Transparent" Margin="-2"/>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

And this is where i want to get DataContext:

public DesignerItem ParentDesignerItem // 
    {
        get
        {

            if (parentDesignerItem == null)
            {

                parentDesignerItem = this.DataContext as DesignerItem;
               // if (parentDesignerItem==null) parentDesignerItem = (this.Template.FindName("grid", this) as Grid).DataContext as DesignerItem;
            }

            return parentDesignerItem;
        }
        set
        {

            parentDesignerItem = value;
        }
    }

I must say that this Style is in XAML which Style of the DesignerItem also.

Answer 1

The problem is in my algorithm P.S i restore some information from SQL, and add 2 times more Connectors with null parameters and when i want to access it gives me these null objects.