Bind variable for view accessor

Question

I am using a Gantt chart where I need to pass in a date field for the schedule as a bind variable.
Since this is a Gantt chart, there is no iterator binding for the child VO (the tasks) in my page definition.
    <gantt IterBinding="ParentVO1Iterator" id="ParentsVO1" xmlns="http://xmlns.oracle.com/adfm/dvt">
      <ganttDataMap>
        <nodeDefinition DefName="com.pat.model.view.ParentsVO" type="Resources">
          <AttrNames>
            <Item Value="ParentId" type="resourceId"/>
          </AttrNames>
          <Accessors>
            <Item Value="MainGantt" type="tasks"/>
          </Accessors>
        </nodeDefinition>
        <nodeDefinition type="Tasks" DefName="com.pat.model.view.MainGantt">
          <AttrNames>
            <Item Value="PatId" type="taskId"/>
            <Item Value="StartTimeDate" type="startTime"/>
            <Item Value="EndTimeDate" type="endTime"/>
            <Item Value="Patname" type="label"/>
          </AttrNames>
        </nodeDefinition>
I have tried retrieving the accessor through the parent VO, and setting the bind variable.
But I get an error if I fire executeQuery() on the child VO that says that the bind variable for the view link is missing.
        DCIteratorBinding iter = dcBindings.findIteratorBinding("ParentVO1Iterator"); // get parent iterator binding
        ViewObject vo = iter.getViewObject();
        MainGanttImpl childVO = (MainGanttImpl)vo.findAttributeDef("MainGantt").getAccessorVO(vo); //get the child VO through the accessor link
        childVO.setpViewDate(new Timestamp(((Date)getGanttDate().getValue()).getTime())); // get the date entered by the user and set to the child VO
        childVO.executeQuery(); //execute the child VO
Exposing the child VO impl through the Application module and setting the bind variable to that instance alone has no impact on the Gantt data returned.

Answer 1

We researched a bit more and hit upon the solution here.
Decompiling ADF Binaries: Search by child attributes on a tree table
I added the same bind variable to my parent VO (and added some SQL 'and : pViewDate = : pViewDate' to the query to just get it to work )
In the parent VO Impl class, I overrode the createViewLinkAccessorRS method:
   protected ViewRowSetImpl createViewLinkAccessorRS(AssociationDefImpl assocDef,
                                                      ViewObjectImpl accessorVO,
                                                      Row masterRow,
                                                      Object[] values) {
            ViewRowSetImpl v =
            super.createViewLinkAccessorRS(assocDef, accessorVO, masterRow,
                                           values);
      //  Timestamp viewDate = (Timestamp )accessorVO.getNamedWhereClauseParam("pViewDate");
        v.setNamedWhereClauseParam("pViewDate", getpViewDate());
        return v;                                                    
  public Timestamp getpViewDate() {
        return (Timestamp) getNamedWhereClauseParam("pViewDate");
This sets the child VO with the value of the bind variable that I have set to my parent VO. This got the Gantt working!