UI Error Validation

Hi,

I Have a DataGrid.And I have Add,Edit,Save functionality for it.When I click on Add, a blank row is added and all are mandatory field.And I am showing Red Circle(through Validator.Validation) .So my requirement is that If there is any UI Error on DataGrid We should not do any Save function.Basically I want to disable the save button on UI Error.I am using WPF+MVVM.

Please help.

Thanks 

Rahman

Rahman