.

    WindowInteropHelper winHelp = new WindowInteropHelper(target);

.

Then use winHelp.Handle insted of GetActiveWindowHandle().

.

Summary

Enumeration comtaining WinHelpCommands - Commands for Windhelp

.

///<Summary>Commands to pass to WinHelp()</Summary>

.

enum WinHelpCommands : uint

.

'''<Summary>Commands to pass to WinHelp()</Summary>

.

Public Enum WinHelpCommands As UInteger

.

Public Enum WinHelpCommands

.

Documentation

[WinHelpCommands] on MSDN

.

WM_TCARD

0x52

Sent to an application that has initiated a training card with Microsoft Windows Help. The message informs the application when the user clicks an authorable button. An application initiates a training card by specifying the HELP_TCARD command in a call to the WinHelp function.

.

    /// Sent to an application that has initiated a training card with Microsoft Windows Help. The message informs the application when the user clicks an authorable button. An application initiates a training card by specifying the HELP_TCARD command in a call to the WinHelp function.

.

    '''Sent to an application that has initiated a training card with Microsoft Windows Help. The message informs the application when the user clicks an authorable button. An application initiates a training card by specifying the HELP_TCARD command in a call to the WinHelp function.

.

    /// The child window should pass the message to the parent window procedure, which should call the WinHelp function using the HELP_WM_HELP command.

.

    ''' The child window should pass the message to the parent window procedure, which should call the WinHelp function using the HELP_WM_HELP command.

.

Summary

Enumeration comtaining WinHelpCommands - Commands for Windhelp

.

///<Summary>Commands to pass to WinHelp()</Summary>

.

enum WinHelpCommands : uint

.

'''<Summary>Commands to pass to WinHelp()</Summary>

.

Public Enum WinHelpCommands As UInteger

.

Public Enum WinHelpCommands

.

Documentation

[WinHelpCommands] on MSDN