DropDownByKey in Table

Question

Hi all,
I want to have a DropDownByKey in the column of a table. The table is bound to a model that is coming from R/3 and I also get another table from R/3 with two columns that contain the "id" and "text" for the DropDownByKey. I have done this many times in a standard web dnypro form (see code below), but never in a table. How to go about this?
2nd question, after using the "apply table template" function, some of the columns were already as "dropdownbykey" with the selection options prefilled. How is this possible since I didn't specify anywhere what the selction options should be? I have also noticed strange (but great) functionality when binding an inputfield to an element of type "currency" (EUR, CAD, USD, etc. was available as input help, but the data wasn't coming from any of the function module in my model!) .... What's going on here?
Thanks for the help.
Cheers,
faB
the code for a normal dropdownbykey bound to a string context element:
// Fill ValueHelps with data:
// Lstar inputField
IWDAttributeInfo attributeInfo = wdContext.getNodeInfo().getAttribute("Lstar");
ISimpleTypeModifiable lstar_Type = attributeInfo.getModifiableSimpleType();
lstar_Type.setFieldLabel("Lstar");
IModifiableSimpleValueSet lstar_valueSet = lstar_Type.getSVServices().getModifiableSimpleValueSet();
int numberOfLstars = wdContext.nodeLstar_Tab().size();
for (int i = 0; i < numberOfLstars; ++i) {
     lstar_valueSet.put(
          wdContext.nodeLstar_Tab().getLstar_TabElementAt(i).getLstar(),
          wdContext.nodeLstar_Tab().getLstar_TabElementAt(i).getName());

Answer 1

Thanks for the responses.
when I use the code above and the "attribute" is simply a string value attribute that I have created in the root context, selecting a value changes all rows.
when bind the ddbk to the model node atribute, I get his error:
com.sap.tc.webdynpro.progmodel.context.ContextException: MappedAttributeInfo : must not modify the datatype of a mapped attribute
does that mean I have create a "sub" value node and attribute in the model node ( with cardinality=1...1 and singleton=false ) and bind the ddbk to this ... doing a manual copy every time a value is selcted?
thanks for the input
faB