Do not place your dataview inside tab 1. Instead, have the dataview as the top-level object, then add the tabcontainer inside the dataview. You can then add any attributes you wish on tab1
For tab2, include a datagrid and choose as the source the association between the project and employee - that will automatically limit the grid to the records you want.
If you allow the modeler to create the dayagrid for you it will include all attributes - just delete the ones you do not wish to display.