counting the number of rows in the crosstab

hi,

I am new to SAP design studio.I have a requirement where ,I have a crosstab which changes the data dynamically based on the selection in the dropdown.

I tried to achieve this using scripting.I used assign data source method to dynamically change the crosstab contents,after that i used some script like

DS_6.getMembers("[Measures]", 100);

In place of measures,the filed name should be dynamic.

Is there any inbuilt function to count the number of rows of a crosstab.If there is any ,please do let me know.

Thanks,

Deepa