File browse control function panel

How to create a file browse control on function panel? Data type for file path is char*. By dropping a input it does not provide with the browse button.
Thanks
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This help topic describes how to add the ... button on the function panel and associate a callback to it.
You could start from the example from samples\functionpanels\Customization\SelectColor.cws and write a function like this:
int DLLEXPORT CVICALLBACK SlectPath (FPCustomInfo *info)
    char path[MAX_PATHNAME_LEN];
    int parameter;
    FPCustom_GetSelectedParameter (info, &parameter);
    FileSelectPopupEx ("", "*.*", "", "select file", VAL_OK_BUTTON, 0, 0, path);
    /* additional processing to convert path into a string literal - enclose in quotes and
    replace special characters like '\' into escape sequences */
    FPCustom_SetParamValue (info, parameter, path);
    return 0;

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