How can I create a Grid with it's X and Y axis bound to different collections?

Question

I need to display something that shows a Week of days along the Columns, and a list of Categories along the Rows, and a list of Tasks that are due in the Cells (See sketch b

Answer 1

Considering that we are talking about WPF, I assume that Viewed Week, Categories, and the Tasks are objects of the model. So what I would do in this case, is to create ModelView that combines that objects based on your app logic relationship into another ModelView's Week object, whom properties actually end up binded to actual UI (Grid, ListView, Telerik control, whatever...).