You can resize the SuperPanel at run time when you set the AllowResize property to True.

To set the AllowResize property in design view, follow these steps:

1. Select View | Properties Window in the Visual Studio menu.
2. Click the drop-down list at the top of the Properties window and select Panel1_C1SuperPanel.
3. Set the AllowResize property to True.

Setting the AllowResize Property in Source View:

To set the AllowResize property in source view, click the source tab and add the following code in your source file:

<asp:Panel ID="Panel1" runat="server"  Height="15px" Width="180px" DropdownHeight="500"

            DropdownWidth="400">

        </asp:Panel>

        <cc1:C1SuperPanelExtender ID="Panel1_C1SuperPanelExtender" runat="server"

            AllowResize="True" KeyboardSupport="False" TargetControlID="Panel1">

            <VScroller ScrollBarVisibility="Hidden">

            </VScroller>

            <resizableoptions handles="All"

                helper="ui-widget-content wijmo-wijsuperpanel-helper">

            </resizableoptions>

        </cc1:C1SuperPanelExtender>