# VAPIMWP_VIEW_SETPREVIEWPANE

Specifies whether the preview pane is used to display a subfile in a container file. When the preview pane is enabled, the viewing area is divided into two panes: one pane displays the contents of the container file, the other displays the contents of the selected subfile. This is a parameter of the `VAPIM_VIEW` message.

## Syntax

    #include <kvvapi.h>
    SendMessage(hWndVAPI, VAPIM_VIEW, VAPIMWP_VIEW_SETPREVIEWPANE,
               (LPARAM) (BOOL) bNewValue );

## Arguments

Argument | Description
--- | ---
`hWndVAPI` | The handle of the VAPI window.
`bNewValue` | A flag that returns `TRUE` or `FALSE`, depending on whether the preview pane was set. Only container files use the preview pane.

## Returns

- `SendMessage()` returns `TRUE` if the call succeeds, in which case `bNewValue` returns `TRUE` or `FALSE`.
- `SendMessage()` returns `FALSE` if the call fails (for example, if there are invalid arguments or if no document is open), in which case `bNewValue` is undefined.

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