Getting Started

RadButtons are located in the Telerik.Windows.Controls.dll and in order to use them in your project you have to add a reference to the assembly.
You can find more info here.

Then in XAML you have to declare the namespace:
xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"

RadButton

Here is an example of a RadButton that executes some logic when it is clicked.

Example 1: Defining a button in XAML

<telerik:RadButton x:Name="radButton" 
                    HorizontalAlignment="Left"
                    VerticalAlignment="Top"
                    Click="radButton_Click"
                    Content="Click Me!" />

Example 2: Defining a Click event handler

private void radButton_Click(object sender, RoutedEventArgs e)
{
    //implement your logic here.
}

Private Sub radButton_Click(sender As Object, e As RoutedEventArgs)
    'implement your logic here. '
End Sub

The greatest advantage of this control is that users can visualize a custom path geometry in the button. Also, the geometry can be positioned relatively to the Content of the button. Here is an example of a RadPathButton that executes some logic when it is clicked.

Example 3: Defining a path button in XAML

<telerik:RadPathButton x:Name="pathButton"
                   Width="100"
                   Height="30"
                   Margin="20"
                   Click="pathButton_Click"
                   ContentPlacement="Right"
                   Content="Click Me!"
                   PathGeometry="M3,7L9,7L9,4L13,8L9,12L9,9L3,9z" />

Example 4: Defining a Click event handler

private void pathButton_Click(object sender, RoutedEventArgs e)
{
    //implement your logic here.
}

Private Sub pathButton_Click(sender As Object, e As RoutedEventArgs)
    'implement your logic here.'
End Sub

Rad Path Button 2

RadDropDownButton

Here is an example of a RadDropDownButton that contains a list of actions in its DropDown Content.

Example 5: Defining a drop down button

<telerik:RadDropDownButton HorizontalAlignment="Left" 
                           VerticalAlignment="Top"
                           Content="Actions">
    <telerik:RadDropDownButton.DropDownContent>
        <telerik:RadContextMenu>
            <telerik:RadMenuItem Header="Add" />
            <telerik:RadMenuItem Header="Edit" />
            <telerik:RadMenuItem Header="Delete" />
        </telerik:RadContextMenu>
    </telerik:RadDropDownButton.DropDownContent>
</telerik:RadDropDownButton>

RadRadioButton

Here is an example of several RadRadioButtons placed in two groups.

Example 6: Defining a radio button

<StackPanel HorizontalAlignment="Left" 
            VerticalAlignment="Top"
            Orientation="Horizontal">
    <StackPanel Margin="0,0,20,0">
        <telerik:RadRadioButton Margin="0,0,0,5" Content="Male" />
        <telerik:RadRadioButton Content="Female" />
    </StackPanel>
    <StackPanel>
        <telerik:RadRadioButton Margin="0,0,0,5" Content="Over 18" />
        <telerik:RadRadioButton Content="Under 18" />
    </StackPanel>
</StackPanel>

RadSplitButton

Here is an example of a RadSplitButton definition, where a ListBox control is used to display a list of items in the RadSplitButton DropDownContent. The Content of the RadSplitButton is bound to the SelectedItem of the ListBox.

Example 7: Defining a split button

<telerik:RadSplitButton HorizontalAlignment="Left" 
                        VerticalAlignment="Top"
                        Content="{Binding Path=SelectedItem.Content, ElementName=FindActions}">
    <telerik:RadSplitButton.DropDownContent>
        <ListBox x:Name="FindActions" SelectionMode="Single">
            <ListBoxItem Content="Quick Find" IsSelected="True" />
            <ListBoxItem Content="Find in Files" />
            <ListBoxItem Content="Find Symbols" />
        </ListBox>
    </telerik:RadSplitButton.DropDownContent>
</telerik:RadSplitButton>

RadToggleButton

Here is an example of a RadToggleButton that toggles the "Monthly Newsletter" feature of a form.

Example 8: Defining a toggle button

<StackPanel HorizontalAlignment="Left" 
            VerticalAlignment="Top"
            Orientation="Horizontal">
    <telerik:RadToggleButton Margin="0,0,10,0">
        <telerik:RadToggleButton.Content>
            <Image Source="/Silverlight.Help.RadButtons;component/Demos/Images/newsletter.png" Stretch="None" />
        </telerik:RadToggleButton.Content>
    </telerik:RadToggleButton>
    <TextBlock Text="Send a monthly newsletter" />
</StackPanel>