OpenSTAAD Function "Output.GetMinMaxBendingMoment"

Please help...

OpenSTAAD Function "Output.GetMinMaxBendingMoment" returns 0 values while successfully executed (returned "true" value). I double checked the member no, strDir = "MZ" and lLoadCase; all are okay.

This function is used in the example included in OpenSTAAD folder under the installation directory (concretebeam). As a side note, both GetMemberEndForces and GetMemberIntermediateForces are working well. However, it is difficult to capture both min and max values using these two function.

Thank you