I have a dataset with two tables (Category, Element) and one relation between them (every row in Category has several rows in Element). At start I saw the Category lines and clicking the (+) sign could navigate to elements.
Problem: when a sublist of elements are shown corresponding to one catgory how can I know with wich category I work with (I need to know also the number of lines in the grid). If I want to iterate through elements I need to know the category.
Please help me!