C1Command’s Menus and Toolbars rely on installing a message filter (implementing the IMessageFilter interface) to implement main menu and some other functionality. In some cases (for example, when C1Command is used in a component's designer, and is run in Visual Studio's design time), installing a message filter does not work. In such cases, C1Command can still be used.

The following code fragment demonstrates how to show a dialog box when a message filter could not be installed. You can use this approach, for example, if you want to show a dialog box in your component's designer.

To write code in Visual Basic

Imports C1.Win.C1Command;
    C1CommandHolder.UninstallMessageFilter() 
    'Create the C1CommandMsgHook
    Dim hook As New C1CommandMsgHook()
    hook.Install()
    Try 
        result = dialog.ShowDialog()
    Finally
                Hook.Uninstall();
    End Try

To write code in C#

using C1.Win.C1Command;
        ...
        C1CommandHolder.UninstallMessageFilter();
        C1CommandMsgHook hook = new C1CommandMsgHook();
        hook.Install();
        try 
        {
          result = dialog.ShowDialog();
        }
        finally
        {
          hook.Uninstall();
        }