GetBindingExpression(TextBox.TextProperty) issue

Hi every Body
I'm coding a Phone book manger C# WPF application,it consist of a data grid which is bind to observal collection
one of the data grid columnis is DataGridTemplateColumn,in edit mode it's consist of a text box and list box as below

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<DataGridTemplateColumn.CellEditingTemplate>

<DataTemplate>

  <StackPanel>

     <DockPanel  Style="{StaticResource DockPanstyle}">

       <Button Name="addConBut" DockPanel.Dock="Left"  Click="addConBut_Click" Style="{StaticResource ButStyle}" Template="{StaticResource addButCT}"/>
 
<Button Name="delConBut" DockPanel.Dock="Right" Click="delConElementBut_Click" Style="{StaticResource ButStyle}" Template="{StaticResource delButCT}"/>

      </DockPanel>
 
<TextBox Name="hTxtBox" Margin="2,6" LostFocus="txtBoxTemp_LostFocus" >

<TextBox.Text>

                                        <MultiBinding Converter="{StaticResource mulBindConv}" UpdateSourceTrigger="Explicit">
 
<Binding Path="AddHomeNumber" ValidatesOnDataErrors="True" ValidatesOnExceptions="True" NotifyOnValidationerror="True" Mode="OneWayToSource">

                                                <Binding.ValidationRules>

                                                     <MyClasses:ContactValidation CheckFor="Home"></MyClasses:ContactValidation>

                                                </Binding.ValidationRules>

                                            </Binding>
 
<Binding ElementName="hnList" Path="SelectedItem" Mode="OneWay"></Binding>

                                        </MultiBinding>

</TextBox.Text>

</TextBox>

<ListBox Name="hnList" ItemsSource="{Binding HomeNumbers}"  DisplayMemberPath="HPhone" IsSynchronizedWithCurrentItem="True" />

</StackPanel>

 </DataTemplate>

 </DataGridTemplateColumn.CellEditingTemplate>

in the edit TextBox which its name is "hTxtBox" i have used Multi Binding,every thing is ok except one thing ,
i want the source to be updated when pressing the add button not when the editing TextBox or the entire row of the DataGrid Lost Focus, so i set UpdateSourceTrigger="Explicit" and i added a handler for the text box lost focus and its handler is "txtBoxTemp_LostFocus", i have added the following code in the handler

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TextBox templ_txt_Bx = e.Source  as TextBox;

bindExpres=templ_txt_Bx.GetBindingExpression(TextBox.TextProperty);

be noted that bindExpres is pre-defined at the beging of the class,and the handler for the add button as below

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if (bindExpres != null)

          {

              bindExpres.UpdateSource();

          }

my problem is
bindExpres always equal null and i don't know why,does any one know why and how can i solve this issue

Jan 8 '12 #1

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GetBindingExpression(TextBox.TextProperty) issue

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