Telerik UI for Silverlight

Anytime you implement a RadContextMenu which displays a long list of items, or simply wish to limit the number of items visible in the menu, you can add scrolling functionality to RadContextMenu, and more specifically vertical scrolling. The process to do that is very simple and straightforward. This article will guide you through the process.

Use Height and DropDownHeight properties

RadContextMenu has Height property. If you set it, but the RadMenuItems inside it doesn't fit in this size, you will see two buttons which can be used to scroll through your collection:

Rad Context Menu Scrolling 01

But if any of your RadMenuItems has submenu items, they will be placed inside another popup. That's why we've added DropDownHeight property for RadMenuItem. The value of the property shows the height of RadMenuItem's submenu. The behavior when the items doesn't fit in the set DropDownHeight is the same as described above:

Rad Context Menu Scrolling 02

Here's a simple code that shows how to use Height and DropDownHeight properties:

CopyXAML
<telerik:RadContextMenu.ContextMenu>
    <telerik:RadContextMenu x:Name="ContextMenu" Height="200">
        <telerik:RadMenuItem Header="Item 1" DropDownHeight="200">
            <telerik:RadMenuItem Header="Item 1.1"/>
            <telerik:RadMenuItem Header="Item 1.2"/>
            <!--Define all items -->
        </telerik:RadMenuItem>
        <telerik:RadMenuItem Header="Item 2"/>
        <!--Define all items -->
    </telerik:RadContextMenu>
<telerik:RadContextMenu.ContextMenu>

Scrolling in RadMenuGroupItem

If you are using RadMenuGroupItem you can control scrolling inside it via ScrollViewer's attached properties - VerticalScrollBarVisibility and HorizontalScrollBarVisibility.

CopyXAML
<telerik:RadContextMenu x:Name="ContextMenu">
        <telerik:RadMenuGroupItem Height="100" Width="150" ScrollViewer.HorizontalScrollBarVisibility="Visible" ScrollViewer.VerticalScrollBarVisibility="Visible">
            <telerik:RadColorSelector/>
        </telerik:RadMenuGroupItem>
    </telerik:RadContextMenu>
</telerik:RadContextMenu.ContextMenu>
Rad Context Menu Scrolling 03