[NTG-context] currentheadnumber / doif.. problem

Hi, I tried to get the full present heading-number. If I am using currentnumber the result is only the last part of the heading-number. So I tried do implement a function like this: \def\presentheadnumber% {\doifelse{\headnumber[section]}{}% {\headnumber[chapter]}% {\headnumber[section]}% } but always the else-part is executed. I also tried to use doifemptyelse, doifnumber etc.. but as soon i am using headnumber[...] only the else-part will be executed. Can anyone help me with this problem? Or am I going a complete wrong way? Thanks