Validation Error wpf with IDataErrorInfo and DataNotations

Question

Hi all,

I got i issue where the validation appear right but the canexecute don't run again. What i mean is if you put a string in the int field the validation don't go to viewmodel again and the button still be enabled and should be disabled. Someone have a solution for that?

view

    <TextBlock Grid.Row="2">Age</TextBlock>
    <TextBox Grid.Column="1" Grid.Row="2" Margin="5,5,5,5" Text="{Binding Age,ValidatesOnExceptions=True, ValidatesOnDataErrors=True, Mode=TwoWay}"></TextBox>

viewmodel

private int age;

[Required]
public int Age
{
    get { return this.age; }
    set
    {
        SetValue<int>(ref this.age, value, true, true,"Age");
    }
}