When placing Checkbox controls inside listbox they are... RSS

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  LarryDev

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  When placing Checkbox controls inside listbox they are randomly being checked when scrolling up a...

  Jul 25, 2009 02:04 PM | LINK

  I originally posted this in the controls forum and have gotten no responses.  But I do believe this is an actual bug in Silverlight 3 and I need to know how to get this fixed.  I would appreciate it if someone could even just try my code in their environment and confirm if you are having the same thing happen.  Also if someone has a Silverlight 2 environment and can test if this problem existed in Silverlight 2.

  Original Post:

  I am trying to code a listbox in Silverlight 3 (released version) and am having issues with placing two checkboxes inside of a list.  I have created a simple example to demonstrate my issue.  In my example I create 50 rows of two checkboxes.  When I run the project I can check the 2nd and 3rd rows left checkboxes.  Then if I grab the listboxes scroll bar and scroll down to the bottom and back up again I am fine if I scroll slowly.  But if I grab the scroll bar and quickly go up and down or if I use the up and down arrows on the scroll bar by just holding my left mouse button down on it I will find random other checkboxes selected.  Has anyone else run in to this issue and does anyone have a solution?  Thank You!

  Here is my sample code:

  MainPage.xaml

  <UserControl x:Class="CheckBoxIssueCSharp.MainPage"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">
      <Grid x:Name="LayoutRoot">
          <ListBox x:Name="lstTest" Width="100" Height="200">
              <ListBox.ItemTemplate>
                  <DataTemplate>
                      <StackPanel x:Name="spTest" Orientation="Horizontal">
                          <CheckBox x:Name="chkOne"/>
                          <CheckBox x:Name="chkTwo"/>
                      </StackPanel>
                  </DataTemplate>
              </ListBox.ItemTemplate>
          </ListBox>
      </Grid>
  </UserControl>
  

     

  MainPage.xaml.cs 

  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Net;
  using System.Windows;
  using System.Windows.Controls;
  using System.Windows.Documents;
  using System.Windows.Input;
  using System.Windows.Media;
  using System.Windows.Media.Animation;
  using System.Windows.Shapes;
  
  namespace CheckBoxIssueCSharp
  {
      public partial class MainPage : UserControl
      {
          public MainPage()
          {
              InitializeComponent();
              for (int n = 0; n <= 51; n++) 
              { 
                  lstTest.Items.Add("");
              }
          }
      }
  }
  

     

  bug report listBoxbox silverlight 3

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  Amanda Wang...

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  Microsoft

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  Re: When placing Checkbox controls inside listbox they are randomly being checked when scrolling...

  Jul 31, 2009 09:23 AM | LINK

  Hi,

  We can reproduce your problem with your provided code.

  BUT if you place the  listbox control  in a ScollView contro can fix your problem. like below:

  <UserControl x:Class="childpage.listbox"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      Width="400" Height="300">
      <Grid x:Name="LayoutRoot" Background="White">
          <ScrollViewer Width="100" Height="200">
          <ListBox x:Name="lstTest" >
              <ListBox.ItemTemplate>
                  <DataTemplate>
                      <StackPanel x:Name="spTest" Orientation="Horizontal" >
                          <CheckBox x:Name="chkOne"/>
                          <CheckBox x:Name="chkTwo"/>
                      </StackPanel>
                  </DataTemplate>
              </ListBox.ItemTemplate>
          </ListBox>
  </ScrollViewer>
      </Grid>
  </UserControl>

  Amanda Wang
  Microsoft Online Community Support
  
  Please remember to mark the replies as answers if they help and unmark them if they provide no help.
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  LarryDev

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  Re: When placing Checkbox controls inside listbox they are randomly being checked when scrolling...

  Jul 31, 2009 02:40 PM | LINK

  Amanda,

  Thank you so much.. That fixed the issue.. and by adding a Padding="0" in the ScrollViewer it makes it look just like a normal listbox on it's own.  Is this issue something that will be fixed in future updates of Silverlight because I believe others will run in to this?

  Thanks Again!

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  gangtom

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  Re: When placing Checkbox controls inside listbox they are randomly being checked when scrolling...

  Mar 19, 2010 04:57 PM | LINK

  I'm facing the same problem with DataGridTemplateColumn with Checkbox as the DataTemplate.

   Any workaround for this problem, Amanda??