BindableProperty Width of ColumnDefinition does not change the view when property changes

        <Grid ColumnSpacing="0" VerticalOptions="FillAndExpand">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="{Binding ProgressCell}"/>
                <ColumnDefinition Width="{Binding ProgressLeftCell}"/>
            </Grid.ColumnDefinitions>
            <StackLayout Grid.Column="0" BackgroundColor="Yellow" HorizontalOptions="FillAndExpand">
            </StackLayout>
            <StackLayout Grid.Column="1" BackgroundColor="Pink" HorizontalOptions="FillAndExpand"/>
        </Grid>
Here when ProgressCell and ProgressLeftCell is Changed , view does not change.