Dynamically Changing Combobox to TextBox in datagrid inside Cell Editing Template in silverlight 4 - silverlight-4.0

Question

I'm making an application in Silverlight 4. I am facing a problem, I need to change a particular combobox into textbox programmatically when a particular column value(using combobox) of the same row is changed.I need to change this on event cellEditEnded.
Please note that I need to change celleditingtemplate combobox to textbox not celltemplate textblock.
This my Column where I need to take the decision of its combo box selected value.
<sdk:DataGridTemplateColumn Header="Instruction Type"
CanUserResize="False" CanUserReorder="False">
<sdk:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Margin="2" Text="{Binding operationType}" />
</DataTemplate>
</sdk:DataGridTemplateColumn.CellTemplate>
<sdk:DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<ComboBox x:Name="instruction" />
</DataTemplate>
</sdk:DataGridTemplateColumn.CellEditingTemplate>
</sdk:DataGridTemplateColumn>
This Column comboBox need to change to textbox here:
<sdk:DataGridTemplateColumn Header="Destination">
<sdk:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Margin="2" Text="{Binding destination}" />
</DataTemplate>
</sdk:DataGridTemplateColumn.CellTemplate>
<sdk:DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<ComboBox x:Name="destination"/>
</DataTemplate>
</sdk:DataGridTemplateColumn.CellEditingTemplate>
</sdk:DataGridTemplateColumn>
C# code:
public class Instruction
{
public string operationType { get; set; }
public string destination { get; set; }
}
private void myGrid_CellEditEnded(object sender, DataGridCellEditEndedEventArgs e)
{
DataGrid obj = (DataGrid)sender;
Instruction obj1 = (Instruction)obj.SelectedItem;
if (e.Column.Header.ToString() == "Instruction Type")
{
if (obj1.operationType == "ADD" || obj1.operationType == "SUB")
{
// Here I need Require Code ????/
}
}
}
I m waitng for anyone Genius who help me out ..

Answer 1

Here is a working example http://anzensoft.smtp.ru/FlashKiller2/DataGridTrickTestPage.html
And here is the source code http://cid-a1de71e9f2ae2f82.office.live.com/self.aspx/.Public/DataGridTrick.zip
xaml code
<Grid x:Name="LayoutRoot" Background="White">
<sdk:DataGrid x:Name="dataGrid1" AutoGenerateColumns="False"
PreparingCellForEdit="dataGrid1_PreparingCellForEdit">
<sdk:DataGrid.Columns>
<sdk:DataGridTemplateColumn Header="Instruction Type">
<sdk:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Margin="2" Text="{Binding operationType}" />
</DataTemplate>
</sdk:DataGridTemplateColumn.CellTemplate>
<sdk:DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<ComboBox x:Name="instruction"
SelectedValue="{Binding operationType, Mode=TwoWay}">
<s:String>ADD</s:String>
<s:String>MUL</s:String>
</ComboBox>
</DataTemplate>
</sdk:DataGridTemplateColumn.CellEditingTemplate>
</sdk:DataGridTemplateColumn>
<sdk:DataGridTemplateColumn Header="Destination">
<sdk:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Margin="2" Text="{Binding destination}" />
</DataTemplate>
</sdk:DataGridTemplateColumn.CellTemplate>
<sdk:DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<Grid>
<ComboBox x:Name="destinationComboBox"
SelectedValue="{Binding destination, Mode=TwoWay}">
<s:String>sdas</s:String>
<s:String>dasdasdasd</s:String>
</ComboBox>
<TextBox x:Name="destinationTextBox"
Text="{Binding destination, Mode=TwoWay}"
Visibility="Collapsed"/>
</Grid>
</DataTemplate>
</sdk:DataGridTemplateColumn.CellEditingTemplate>
</sdk:DataGridTemplateColumn>
</sdk:DataGrid.Columns>
</sdk:DataGrid>
</Grid>
C# code
namespace DataGridTrick
{
public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();
Loaded += new RoutedEventHandler(MainPage_Loaded);
}
void MainPage_Loaded(object sender, RoutedEventArgs e)
{
dataGrid1.ItemsSource = new List<Instruction>()
{
new Instruction(){operationType = "ADD", destination ="sdas"},
new Instruction(){operationType = "ADD", destination = "dasdasdasd"}
};
}
private void dataGrid1_PreparingCellForEdit(object sender, DataGridPreparingCellForEditEventArgs e)
{
if ((string)e.Column.Header == "Destination")
{
var tb = e.EditingElement.FindName("destinationTextBox") as TextBox;
var cb = e.EditingElement.FindName("destinationComboBox") as ComboBox;
var instruction = e.EditingElement.DataContext as Instruction;
if (tb == null || cb == null || instruction == null)
{
throw new
Exception("Something wrong here.. this dosen't have to happen!!");
}
else
{
if (instruction.operationType == "MUL")
{
tb.DataContext = e.EditingElement.DataContext;
cb.DataContext = null;
tb.Visibility = System.Windows.Visibility.Visible;
cb.Visibility = System.Windows.Visibility.Collapsed;
}
else
{
tb.DataContext = null;
cb.DataContext = e.EditingElement.DataContext;
tb.Visibility = System.Windows.Visibility.Collapsed;
cb.Visibility = System.Windows.Visibility.Visible;
}
}
}
}
}
public class Instruction
{
public string operationType { get; set; }
public string destination { get; set; }
}
}