Use S-Function parameters from dialog box

Hi,

I have created S-Functions with mdlCheckParameters method. I can insert into dialog box numbers in range (0;Inf). How can I configure mdlCheckParameters to inserting negative and decimal numbers into dialog box?

Here is mdlCheckParameters code:

#define MDL_CHECK_PARAMETERS
#if defined(MDL_CHECK_PARAMETERS) && defined(MATLAB_MEX_FILE)
/* Function: mdlCheckParameters =============================================
* Abstract:
*    Validate that the parameter is a positive finite integer scalar
*/
static void mdlCheckParameters(SimStruct *S)
{
  int ival;
  bool badParam = false;

    /* All parameters must be positive non-zero integers */
    const mxArray *m = ssGetSFcnParam(S,0);

    if (mxGetNumberOfElements(m) != 1 ||
        !mxIsNumeric(m) || !mxIsDouble(m) || mxIsLogical(m) ||
        mxIsComplex(m) || mxIsSparse(m) || !mxIsFinite(mxGetPr(m)[0])) {

        badParam = true;
    } else if (((ival=(int_T)mxGetPr(m)[0]) <= 0) ||
        (real_T)ival != mxGetPr(m)[0]) {
        badParam = true;
    }

    if (badParam) {
        ssSetErrorStatus(S,"The parameter must be a positive non-zero "
                         "integer value.");
        return;
    }
 }
#endif /* MDL_CHECK_PARAMETERS */

Thanks!

Vit