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_plugin_menuadd
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This function adds a new child menu to a menu.

::

    int _plugin_menuadd(
        int hMenu, //menu handle to add the new child menu to
        const char* title //child menu title
    );

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Parameters
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:hMenu: Menu handle from a previously-added child menu or from the main plugin menu.
:title: Menu title.

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Return Values
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Returns the child menu handle (unique), -1 on failure.