Maybe someone can help me to sort out a few problems.

I want to implement Simple grid with following columns, 

1. Date 

2. Project

3) Hours

I am using Excell Behaviour,

My Problems

1) When I am in a middle of editing Hours cell I dont want to wait until user hits enter to commit changes, all I want (like in excell) if user changes selected cell (using down arrow) do select bottom cell and commit changes

2) Date cell should be editable - but I dont want user to manually edit text - he should select it using date time picker 
3) Projects are added ro Constraints and available for selection in Combobo. All I want is to have autocomplete feature for this combobox

4) Should accept only numeric values and decimal point