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Unable to bind collection to ComboBox in silverlight

I've a ObservableCollection, when I want to display this ObservableCollection with CheckBox I am simply binding the contents to CheckBox but when I want to display the same collection by using ComboBox I am unable to do that. Any suggestions?
XAML: Display collection using CheckBox --WORKS
<ItemsControl ItemsSource="{Binding Synonyms}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" Margin="0,5,0,0" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<!--Display items in CheckBox-->
<CheckBox Content="{Binding Display}" Margin="10,0,0,0" /> // Display is the collection.
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
Output:
XAML: Display collection using ComboBox --NOTHING OVER HERE
<ItemsControl ItemsSource="{Binding Synonyms}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" Margin="0,5,0,0" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<!--Display items in ComboBox.-->
Approach - 1
<ComboBox>
<ComboBoxItem Content="{Binding Display}"/>
</ComboBox>
Approach - 2
<ComboBox ItemsSource="{Binding Path=Synonyms}" DisplayMemberPath="Display"/>
Approach - 3
<ComboBox >
<ComboBox.ItemTemplate>
<DataTemplate>
<Border BorderBrush="Green" BorderThickness="1" Padding="5">
<TextBlock Text="{Binding Path=Display,StringFormat='Display: {0}'}" />
</Border>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
Output:
I want to display items(one,two,three, etc.) inside oneComboBox with Select All option. I've tried several approaches but nothing. What am I missing here?

The checkbox is not designed to hold multiple items unlike the Combobox so implementing a system designed for the checkbox is not relevant for the combobox.
To solve your issue, remove the combobox from the ItemsControl and have it stand on its own:
<ComboBox ItemsSource="{Binding Synonyms}" DisplayMemberPath="Display"/>
Which tells the combobox to bind its ItemsSource to the data context which is unspecified, which is fine, so it then gets it's parent's data context. That process works its way up to each parent until it finds a bound data context (most likely the page's datacontext to a VM instance).
Assuming that the data context is valid at some point in the visual tree, it will bind to that instance and look for a property named Synonyms. From the Synonyms property it will use that as a list to display items.
To show (display) text in the combobox (instead defaulting to the item's ToString()) the combobox will show the string from the item's property Display.
Giving a list of items in one drop down.

The short answer, is you should use a ComboBox as the root element, not ItemsControl. CompboBox is just a specialized version of ItemsControl.
<ComboBox ItemsSource="{Binding Synonyms}" DisplayMemberPath="Display"/>
The longer answer.
ComboBox derives from ItemsControl, so you get all the features the base class, plus additional features.
ItemsControl (and its derived classes) provides a way of repeating a set of data in the UI. The DataTemplate is where you specify what UI you want for each "row" of data in the Synonyms source.
What you are doing is asking Silverlight to create a separate ComboBox for each underlying data row.
You can still use a DataTemplate within the ComboBox. Like this.
<ComboBox ItemsSource="{Binding Synonyms}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<!--Display items in CheckBox-->
<TextBox Text="{Binding Display}"
Margin="10,0,0,0"
FontWeight="Bold" />
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>

WPF - How to get object bound to each ListItem using Binding

Please see the following code snippet first.
<ListBox ItemsSource="{Binding MyObjectList}" Grid.Column="2" Grid.Row="1" Grid.RowSpan="4">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<mynamespace:MyCustomControl MyItem="{Binding MyObjectList/}" DefaultDistance="0.25" />
<TextBlock Text="{Binding Part}" FontSize="16pt" HorizontalAlignment="Center">
</TextBlock>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
I want to display each and every item in MyObjectList using MyCustomControl. That item is a custom object with several properties. I was able to assign Text of a TextBlock to MyObject.Part, but unable to get the MyObject itself. I tried several Path options but did not succeed. Would you please help me on that? Thank you.

You should change this fragment:
MyItem="{Binding MyObjectList/}"
In the following way:
MyItem="{Binding}"
In order to bind MyItem property to the current item in MyObjectList. I assume that MyItem is a dependency property.

ListView SelectItem Binding not working as expected

I have a fairly straight forward listview control for my Windows 8 XAML/C# application. I am binding the listview to a PersonList and that works correctly. However, what I'd like to do and haven't been able to find the answer for is I want the to click an item in the listview and be able to display the PersonSingle object to the other textboxes on the screen.
I've read some posts that indicate that the listview may not be the right control for this operation. Am I missing something in my listview that would allow me to do this operation or should I use a different control?
<ListView
x:Name="itemListView"
Visibility="Visible"
Width="auto"
Height="auto"
ItemsSource="{Binding PersonList, Mode=TwoWay}"
SelectedItem = "{Binding PersonSingle, Mode=OneWay}"
ItemTemplate="{StaticResource person80Template}"
SelectionMode="Single"
Grid.Row="1"
Grid.Column="1"
VerticalAlignment="Stretch">
<ListView.GroupStyle>
<GroupStyle>
<GroupStyle.HeaderTemplate>
<DataTemplate>
<Grid Margin="7,7,0,0">
<Button
AutomationProperties.Name="PersonValue"
Content="{Binding PersonName}"
Style="{StaticResource TextButtonStyle}"/>
</Grid>
</DataTemplate>
</GroupStyle.HeaderTemplate>
</GroupStyle>
</ListView.GroupStyle>
</ListView>
UPDATE:
So I figured out how to do it in a non-MVVM way (or at least not in a true MVVM way)
I added an ItemClick event to my ListView:
ItemClick="itemListView_ItemClick"
And then in the code behind I added the following:
private void itemListView_ItemClick(object sender, ItemClickEventArgs e)
{
VM.PersonSingle = ((Person)e.ClickedItem);
}
That works, but like I said, it doesn't feel very MVVM'ish. If you have any suggestions on how to make it work without having to manually set the PersonSingle object please answer below.

Your ItemClick solution is the right solution. You could create an attached behavior if you are opposed to handling events, but that's your choice.

Listbox Databinding in wpf

I am binding the data coming form database to ListBoxItem's, below is the code:
public void load_users()
{
RST_DBDataContext conn = new RST_DBDataContext();
List<TblUser> users = (from s in conn.TblUsers
select s).ToList();
Login_Names.ItemsSource = users;
}
And in XAML, there is the below code:
<ListBox Name="Login_Names"
ItemsSource="{Binding Path=UserName}"
HorizontalAlignment="Left"
Height="337" Margin="10,47,0,0"
Padding="0,0,0,0" VerticalAlignment="Top" Width="156">
But it does not works, it shows table name, but I need to see the usernames coming from table, there is column called UserName in TblUsers.
Thanks in Advance.

try this
Create DataTemplate in resource section and then assign it to listbox
<Grid.Resources>
<DataTemplate x:Key="userNameTemplate">
<TextBlock Text="{Binding Path=UserName}"/>
</DataTemplate>
<ListBox Name="listBox" ItemsSource="{Binding}"
ItemTemplate="{StaticResource userNameTemplate}"/>

Since the ItemsSource is set already in code behind, set the DisplayMemberPath to UserName in XAML.
<ListBox Name="Login_Names"
DisplayMemberPath="UserName"
HorizontalAlignment="Left"
Height="337" Margin="10,47,0,0"
Padding="0,0,0,0" VerticalAlignment="Top" Width="156">

Bind Dictionary to ItemsControl in C#/WPF

I'm trying to bind KeyValuePair Elements from a Dictionary to a ItemsControl.
My Dictionary has 15 Elements and the following code shows me 15 TextBoxes:
<WrapPanel Name="PersonsWrapPanel" Grid.Row="0">
<ItemsControl ItemsSource="{Binding Persons}" >
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel Orientation="Horizontal" Width="auto">
</WrapPanel>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBox Text="{Binding Value.Text}"></TextBox>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</WrapPanel>
Unfortunately without any TextBox content (which would be Key or Value).
Any ideas?

Perhaps try binding directly to the values of the dictionary:
ItemsSource="{Binding Persons.Values}"
If I am understanding your XAML properly, each object in the dictionary has a field called "Text" to which you are trying to bind. If so and you make the above changes, you will need to change your DataTemplate as well:
<TextBox Text="{Binding Text}" />
See this article for more info. HTH.

I solved it by using this line:
<TextBox Text="{Binding Value, Mode=OneWay}"></TextBox>
The code on http://www.dev102.com/2008/03/07/binding-a-wpf-control-to-a-dictionary/ doesn't seem to work.

Let us say you have a Dictionary called RowValues, with both the [key, value] defined as [string, string].
Now to bind to the Value Pair of this dictionary, you can do the following:
<ItemsControl ItemsSource="{Binding RowValues.Values}" >
To display the text (Value), you can bind as:
<TextBlock Text="{Binding}"/>