Error when using controltemplate and binding together in textbox datagrid WPF

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Hi I have a DataGrid. I used TextBox in its cells.
I made a ControlTemplate for it.
So My problem is when I use controlTemplate, the Binding of TextBox won't work. But if I directly set everything in the DataTemplate, the Binding works perfect.
Any Idea please?

What I have tried:

Binding to TextBox works perfect in this code:

XML

<DataGridTemplateColumn Header="Text" IsReadOnly="False" Width="38*">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <TextBox 
                Text="{Binding Path=TheText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                Background="Transparent"
                Foreground="White"/>
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>

Binding to TextBox doesn't work in this code!!! :

XML

<DataGridTemplateColumn Header="Text" IsReadOnly="False" Width="38*">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <TextBox 
                Text="{Binding Path=TheText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" 
                Template="{DynamicResource TextBoxOfCellsInDataGridOfSubtitle}"/>
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>

Posted 15-Jan-24 3:07am

Sh.H.

Updated 15-Jan-24 3:09am

v3

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Sh.H. · Accepted Answer · 2024-01-15T04:17:00

I found the answer.
I should bind the Text to parent, then bind to the Class.

XML

<DataGridTemplateColumn Header="Text" IsReadOnly="False" Width="38*">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <TextBox 
                Text="{Binding Path=TheText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" 
                Template="{DynamicResource TextBoxOfCellsInDataGridOfSubtitle}"/>
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>

XML

<ControlTemplate x:Key="TextBoxOfCellsInDataGridOfSubtitle" TargetType="TextBox">
    <TextBox Text="{TemplateBinding Text}"
             AcceptsReturn="False" 
             CaretBrush="White" 
             Foreground="White"
             Background="Transparent"
             BorderBrush="Transparent"
             BorderThickness="0"
             TextAlignment="Center"
             HorizontalAlignment="Stretch"
             HorizontalContentAlignment="Stretch"
             VerticalAlignment="Stretch"
             VerticalContentAlignment="Center"/>
</ControlTemplate>